SIC 4512 Air Transportation, Scheduled

Delta Air Lines Inc. vs Ryanair Holdings plc

WatchlistDAL / RYAAYPrices through Oct 22, 2026

Why these are rivals: #1 and #3 by market value ($49B vs $28B) with SEC SIC 4512 (Air Transportation, Scheduled).

Rivals, but right now the price gap does not have a measured habit of closing, so there is no paper idea, whatever the gap.

Co-movement: daily return correlation, 252 sessions: 0.59 (needs >= 0.60)
Mean reversion: ADF t-statistic of the spread: -0.93 (needs <= -2.873 (5% critical value))
Speed: half-life of the spread, sessions: 108.08 (needs <= 63)

Business leadership

Business size

Annual revenue reported to the SEC. Scale, not market share.

Year	DAL	RYAAY	Larger
2025	$63.4B	-	-
2024	$61.6B	-	-
2023	$58.0B	-	-
2022	$50.6B	-	-
2021	$29.9B	-	-
2020	$17.1B	-	-

Market value: DAL $49.1B, RYAAY $27.6B.

Stock leadership

DAL is ahead now

Measured against the pair's own last 252 trading days.

DAL leads RYAAY by 1.17 standard deviations: +23.8% over its usual price ratio. 1 lead switch in the last year.

Price change	3 mo	6 mo	12 mo
DAL	-6.8%	+15.9%	+27.2%
RYAAY	-5.6%	-5.6%	-12.5%

Relationship

Not a measured twin today

Only these tests can make a pair tradable on paper.

Pass: Aligned sessions: 2521 (needs >= 254)
Fail: Co-movement: daily return correlation, 252 sessions: 0.59 (needs >= 0.60)
Fail: Mean reversion: ADF t-statistic of the spread: -0.93 (needs <= -2.873 (5% critical value))
Fail: Speed: half-life of the spread, sessions: 108.08 (needs <= 63)
Data: Both stocks current

The twins over two years

Prices side by side, and the gap between them

DAL Delta Air Lines Inc. RYAAY Ryanair Holdings plcPrice index, 100 = 2024-10-18. Tint = which stock is ahead of the pair's usual 1-year relationship (z beyond +/-0.5).

Spread z-score: DAL relative to RYAAY, against the 252 sessions before each day. Above 0: DAL ahead; below 0: RYAAY ahead. Lines at +/-2 (idea) and +/-4 (stop).

Data table (504 sessions)

Date	DAL index	RYAAY index	z	Ahead
2026-10-22	142.04	118.14	+1.17	DAL ahead
2026-10-21	139.19	119.08	+1.02	DAL ahead
2026-10-20	137.38	118.86	+0.97	DAL ahead
2026-10-19	133.75	115.58	+0.98	DAL ahead
2026-10-16	135.07	115.65	+1.04	DAL ahead
2026-10-15	139.93	114.66	+1.29	DAL ahead
2026-10-14	137.37	112.99	+1.28	DAL ahead
2026-10-13	142.60	116.31	+1.34	DAL ahead
2026-10-12	143.57	116.66	+1.37	DAL ahead
2026-10-09	147.26	119.39	+1.39	DAL ahead
2026-10-08	147.20	118.95	+1.42	DAL ahead
2026-10-07	148.69	123.27	+1.29	DAL ahead
2026-10-06	149.93	122.97	+1.36	DAL ahead
2026-10-05	148.89	120.41	+1.45	DAL ahead
2026-10-02	150.70	121.18	+1.50	DAL ahead
2026-10-01	150.77	119.26	+1.60	DAL ahead
2026-09-30	149.57	121.09	+1.49	DAL ahead
2026-09-29	152.10	122.14	+1.55	DAL ahead
2026-09-28	150.59	121.35	+1.54	DAL ahead
2026-09-25	152.22	121.73	+1.60	DAL ahead
2026-09-24	148.32	118.95	+1.60	DAL ahead
2026-09-23	146.51	120.38	+1.48	DAL ahead
2026-09-22	150.39	122.94	+1.52	DAL ahead
2026-09-21	147.85	119.52	+1.60	DAL ahead
2026-09-18	142.69	117.79	+1.49	DAL ahead
2026-09-17	142.35	117.76	+1.49	DAL ahead
2026-09-16	139.55	115.85	+1.49	DAL ahead
2026-09-15	141.38	114.35	+1.65	DAL ahead
2026-09-14	143.01	117.02	+1.60	DAL ahead
2026-09-11	143.21	118.42	+1.56	DAL ahead
2026-09-10	140.22	116.66	+1.53	DAL ahead
2026-09-09	141.13	119.41	+1.45	DAL ahead
2026-09-08	141.51	119.68	+1.47	DAL ahead
2026-09-04	143.67	121.86	+1.46	DAL ahead
2026-09-03	141.13	120.41	+1.44	DAL ahead
2026-09-02	140.04	119.79	+1.44	DAL ahead
2026-09-01	136.88	118.47	+1.38	DAL ahead
2026-08-31	139.78	121.88	+1.35	DAL ahead
2026-08-28	143.49	123.55	+1.43	DAL ahead
2026-08-27	145.41	122.06	+1.60	DAL ahead
2026-08-26	148.89	124.79	+1.63	DAL ahead
2026-08-25	149.86	126.08	+1.62	DAL ahead
2026-08-24	147.81	124.57	+1.62	DAL ahead
2026-08-21	147.69	122.83	+1.72	DAL ahead
2026-08-20	145.27	119.99	+1.78	DAL ahead
2026-08-19	149.27	120.60	+1.93	DAL ahead
2026-08-18	153.58	121.97	+2.06	DAL ahead
2026-08-17	156.97	126.22	+2.01	DAL ahead
2026-08-14	160.13	129.45	+2.00	DAL ahead
2026-08-13	163.64	130.24	+2.12	DAL ahead
2026-08-12	161.16	130.66	+2.03	DAL ahead
2026-08-11	162.03	130.68	+2.08	DAL ahead
2026-08-10	159.87	130.99	+2.00	DAL ahead
2026-08-07	163.69	132.49	+2.10	DAL ahead
2026-08-06	164.84	133.28	+2.12	DAL ahead
2026-08-05	166.92	134.69	+2.16	DAL ahead
2026-08-04	166.25	132.49	+2.26	DAL ahead
2026-08-03	164.14	131.98	+2.23	DAL ahead
2026-07-31	156.70	128.79	+2.12	DAL ahead
2026-07-30	158.76	132.45	+2.04	DAL ahead
2026-07-29	154.57	127.36	+2.15	DAL ahead
2026-07-28	160.16	131.61	+2.19	DAL ahead
2026-07-27	155.32	126.50	+2.28	DAL ahead
2026-07-24	152.44	125.14	+2.26	DAL ahead
2026-07-23	146.90	124.04	+2.10	DAL ahead
2026-07-22	149.68	128.57	+2.01	DAL ahead
2026-07-21	151.67	129.43	+2.08	DAL ahead
2026-07-20	151.51	129.67	+2.09	DAL ahead
2026-07-17	150.84	137.73	+1.66	DAL ahead
2026-07-16	155.38	146.07	+1.47	DAL ahead
2026-07-15	154.05	146.67	+1.40	DAL ahead
2026-07-14	153.24	141.51	+1.63	DAL ahead
2026-07-13	154.46	140.68	+1.74	DAL ahead
2026-07-10	156.61	142.26	+1.78	DAL ahead
2026-07-09	159.50	141.21	+1.98	DAL ahead
2026-07-08	156.43	144.20	+1.71	DAL ahead
2026-07-07	158.84	146.05	+1.74	DAL ahead
2026-07-06	164.30	147.61	+1.93	DAL ahead
2026-07-02	166.22	144.16	+2.20	DAL ahead
2026-07-01	166.77	139.73	+2.48	DAL ahead
2026-06-30	167.85	142.53	+2.42	DAL ahead
2026-06-29	166.97	141.58	+2.47	DAL ahead
2026-06-26	165.90	141.95	+2.44	DAL ahead
2026-06-25	165.07	141.25	+2.47	DAL ahead
2026-06-24	162.46	140.28	+2.44	DAL ahead
2026-06-23	155.41	137.27	+2.30	DAL ahead
2026-06-22	153.98	138.10	+2.21	DAL ahead
2026-06-18	150.86	134.80	+2.27	DAL ahead
2026-06-17	147.40	133.48	+2.20	DAL ahead
2026-06-16	149.00	136.80	+2.11	DAL ahead
2026-06-15	150.66	136.19	+2.27	DAL ahead
2026-06-12	148.85	132.80	+2.40	DAL ahead
2026-06-11	146.65	130.73	+2.44	DAL ahead
2026-06-10	137.04	122.72	+2.45	DAL ahead
2026-06-09	145.47	127.67	+2.65	DAL ahead
2026-06-08	140.16	123.99	+2.63	DAL ahead
2026-06-05	142.33	125.42	+2.71	DAL ahead
2026-06-04	142.49	125.40	+2.77	DAL ahead
2026-06-03	141.18	125.80	+2.71	DAL ahead
2026-06-02	143.41	129.25	+2.66	DAL ahead
2026-06-01	146.00	130.66	+2.77	DAL ahead
2026-05-29	147.81	133.79	+2.72	DAL ahead
2026-05-28	147.83	134.80	+2.70	DAL ahead
2026-05-27	146.59	134.49	+2.69	DAL ahead
2026-05-26	142.28	132.71	+2.58	DAL ahead
2026-05-22	136.45	131.23	+2.34	DAL ahead
2026-05-21	135.57	126.39	+2.67	DAL ahead
2026-05-20	132.83	125.23	+2.61	DAL ahead
2026-05-19	121.43	119.22	+2.26	DAL ahead
2026-05-18	125.88	123.46	+2.30	DAL ahead
2026-05-15	125.86	117.46	+2.83	DAL ahead
2026-05-14	128.23	121.53	+2.72	DAL ahead
2026-05-13	127.33	120.93	+2.75	DAL ahead
2026-05-12	126.72	123.88	+2.50	DAL ahead
2026-05-11	127.60	124.59	+2.56	DAL ahead
2026-05-08	131.42	127.82	+2.64	DAL ahead
2026-05-07	131.02	130.57	+2.43	DAL ahead
2026-05-06	131.43	128.84	+2.65	DAL ahead
2026-05-05	126.99	119.81	+3.12	DAL ahead
2026-05-04	122.76	117.19	+3.06	DAL ahead
2026-05-01	123.62	119.90	+2.94	DAL ahead
2026-04-30	121.85	120.29	+2.79	DAL ahead
2026-04-29	118.76	118.67	+2.71	DAL ahead
2026-04-28	120.47	119.79	+2.82	DAL ahead
2026-04-27	122.22	122.23	+2.80	DAL ahead
2026-04-24	122.67	124.74	+2.65	DAL ahead
2026-04-23	122.53	125.20	+2.64	DAL ahead
2026-04-22	122.60	129.12	+2.31	DAL ahead
2026-04-21	125.84	130.20	+2.57	DAL ahead
2026-04-20	127.62	133.15	+2.51	DAL ahead
2026-04-17	128.53	136.54	+2.32	DAL ahead
2026-04-16	125.25	126.30	+3.03	DAL ahead
2026-04-15	129.01	136.41	+2.47	DAL ahead
2026-04-14	128.49	137.68	+2.33	DAL ahead
2026-04-13	120.16	136.78	+1.56	DAL ahead
2026-04-10	121.54	137.27	+1.68	DAL ahead
2026-04-09	121.56	139.86	+1.45	DAL ahead
2026-04-08	122.01	141.32	+1.37	DAL ahead
2026-04-07	117.60	128.31	+2.19	DAL ahead
2026-04-06	119.68	129.14	+2.36	DAL ahead
2026-04-02	119.64	129.30	+2.38	DAL ahead
2026-04-01	121.15	132.12	+2.28	DAL ahead
2026-03-31	119.14	127.23	+2.60	DAL ahead
2026-03-30	113.24	123.02	+2.39	DAL ahead
2026-03-27	116.18	128.73	+2.13	DAL ahead
2026-03-26	119.82	133.59	+2.05	DAL ahead
2026-03-25	121.85	135.09	+2.14	DAL ahead
2026-03-24	119.44	132.42	+2.16	DAL ahead
2026-03-23	116.72	130.53	+2.06	DAL ahead
2026-03-20	113.69	126.85	+2.11	DAL ahead
2026-03-19	116.51	130.97	+2.03	DAL ahead
2026-03-18	114.35	131.63	+1.69	DAL ahead
2026-03-17	116.18	135.48	+1.51	DAL ahead
2026-03-16	109.03	136.78	+0.44	near the usual relationship
2026-03-13	105.34	134.91	+0.13	near the usual relationship
2026-03-12	103.84	135.31	-0.13	near the usual relationship
2026-03-11	105.99	140.74	-0.41	near the usual relationship
2026-03-10	106.22	140.63	-0.37	near the usual relationship
2026-03-09	108.57	138.78	+0.12	near the usual relationship
2026-03-06	105.75	139.95	-0.38	near the usual relationship
2026-03-05	109.87	136.14	+0.53	DAL ahead
2026-03-04	114.39	143.34	+0.36	near the usual relationship
2026-03-03	115.77	140.85	+0.73	DAL ahead
2026-03-02	115.14	143.74	+0.37	near the usual relationship
2026-02-27	117.74	148.56	+0.21	near the usual relationship
2026-02-26	126.36	153.26	+0.67	DAL ahead
2026-02-25	124.34	147.90	+0.86	DAL ahead
2026-02-24	124.07	144.35	+1.08	DAL ahead
2026-02-23	119.86	142.22	+0.81	DAL ahead
2026-02-20	124.44	141.91	+1.19	DAL ahead
2026-02-19	120.86	141.21	+0.90	DAL ahead
2026-02-18	127.44	145.28	+1.10	DAL ahead
2026-02-17	126.97	146.78	+0.93	DAL ahead
2026-02-13	123.66	144.16	+0.81	DAL ahead
2026-02-12	124.55	143.28	+0.90	DAL ahead
2026-02-11	127.99	143.21	+1.12	DAL ahead
2026-02-10	133.44	147.66	+1.18	DAL ahead
2026-02-09	134.41	153.03	+0.90	DAL ahead
2026-02-06	135.04	151.02	+1.02	DAL ahead
2026-02-05	125.05	148.69	+0.48	near the usual relationship
2026-02-04	126.99	156.57	+0.17	near the usual relationship
2026-02-03	126.24	155.78	+0.14	near the usual relationship
2026-02-02	123.80	158.64	-0.16	near the usual relationship
2026-01-30	118.08	155.40	-0.38	near the usual relationship
2026-01-29	119.25	155.16	-0.30	near the usual relationship
2026-01-28	117.97	151.22	-0.19	near the usual relationship
2026-01-27	118.53	149.68	-0.09	near the usual relationship
2026-01-26	120.97	151.88	-0.06	near the usual relationship
2026-01-23	121.79	156.22	-0.22	near the usual relationship
2026-01-22	123.57	156.11	-0.13	near the usual relationship
2026-01-21	123.57	155.07	-0.09	near the usual relationship
2026-01-20	120.90	152.98	-0.16	near the usual relationship
2026-01-16	126.22	150.30	+0.23	near the usual relationship
2026-01-15	127.85	151.88	+0.23	near the usual relationship
2026-01-14	122.74	149.68	+0.05	near the usual relationship
2026-01-13	124.25	149.70	+0.11	near the usual relationship
2026-01-12	127.29	152.15	+0.15	near the usual relationship
2026-01-09	129.59	153.55	+0.20	near the usual relationship
2026-01-08	127.76	155.29	+0.03	near the usual relationship
2026-01-07	128.41	157.36	-0.02	near the usual relationship
2026-01-06	129.43	157.54	+0.01	near the usual relationship
2026-01-05	128.71	162.49	-0.21	near the usual relationship
2026-01-02	123.76	159.59	-0.35	near the usual relationship
2025-12-31	124.37	158.90	-0.30	near the usual relationship
2025-12-30	124.27	160.73	-0.38	near the usual relationship
2025-12-29	124.61	160.09	-0.34	near the usual relationship
2025-12-26	126.97	162.27	-0.32	near the usual relationship
2025-12-24	127.17	161.79	-0.30	near the usual relationship
2025-12-23	126.34	160.22	-0.29	near the usual relationship
2025-12-22	129.14	160.93	-0.19	near the usual relationship
2025-12-19	127.35	159.59	-0.23	near the usual relationship
2025-12-18	125.72	157.94	-0.25	near the usual relationship
2025-12-17	124.95	155.23	-0.20	near the usual relationship
2025-12-16	127.49	155.27	-0.09	near the usual relationship
2025-12-15	127.72	156.75	-0.14	near the usual relationship
2025-12-12	125.11	156.75	-0.26	near the usual relationship
2025-12-11	126.45	154.68	-0.13	near the usual relationship
2025-12-10	125.32	148.14	+0.05	near the usual relationship
2025-12-09	120.81	145.70	-0.07	near the usual relationship
2025-12-08	120.47	145.52	-0.09	near the usual relationship
2025-12-05	120.25	145.50	-0.10	near the usual relationship
2025-12-04	120.50	143.01	+0.00	near the usual relationship
2025-12-03	120.95	144.60	-0.05	near the usual relationship
2025-12-02	116.74	145.61	-0.28	near the usual relationship
2025-12-01	114.96	148.07	-0.45	near the usual relationship
2025-11-28	114.87	150.03	-0.53	RYAAY ahead
2025-11-26	115.18	150.56	-0.54	RYAAY ahead
2025-11-25	111.38	148.21	-0.64	RYAAY ahead
2025-11-24	108.73	142.86	-0.58	RYAAY ahead
2025-11-21	104.96	136.76	-0.55	RYAAY ahead
2025-11-20	100.30	133.77	-0.67	RYAAY ahead
2025-11-19	101.92	136.21	-0.69	RYAAY ahead
2025-11-18	102.38	135.44	-0.64	RYAAY ahead
2025-11-17	99.93	135.02	-0.75	RYAAY ahead
2025-11-14	104.68	138.63	-0.66	RYAAY ahead
2025-11-13	107.37	142.22	-0.67	RYAAY ahead
2025-11-12	108.39	142.92	-0.65	RYAAY ahead
2025-11-11	103.48	142.33	-0.87	RYAAY ahead
2025-11-10	104.95	141.87	-0.79	RYAAY ahead
2025-11-07	105.52	140.46	-0.72	RYAAY ahead
2025-11-06	103.60	139.03	-0.76	RYAAY ahead
2025-11-05	104.91	141.29	-0.79	RYAAY ahead
2025-11-04	99.73	142.20	-1.08	RYAAY ahead
2025-11-03	104.84	143.08	-0.87	RYAAY ahead
2025-10-31	102.83	137.53	-0.77	RYAAY ahead
2025-10-30	102.37	135.48	-0.73	RYAAY ahead
2025-10-29	105.30	134.12	-0.54	RYAAY ahead
2025-10-28	103.69	135.00	-0.66	RYAAY ahead
2025-10-27	108.33	135.64	-0.47	near the usual relationship
2025-10-24	109.23	135.51	-0.43	near the usual relationship
2025-10-23	105.32	133.28	-0.53	RYAAY ahead
2025-10-22	107.53	135.00	-0.49	near the usual relationship
2025-10-21	111.68	135.00	-0.31	near the usual relationship
2025-10-20	110.66	136.03	-0.40	near the usual relationship
2025-10-17	106.88	136.43	-0.59	RYAAY ahead
2025-10-16	108.24	135.64	-0.50	RYAAY ahead
2025-10-15	110.57	133.79	-0.33	near the usual relationship
2025-10-14	109.80	135.24	-0.42	near the usual relationship
2025-10-13	105.23	134.32	-0.60	RYAAY ahead
2025-10-10	103.01	132.84	-0.66	RYAAY ahead
2025-10-09	106.76	132.58	-0.47	near the usual relationship
2025-10-08	102.37	136.39	-0.83	RYAAY ahead
2025-10-07	101.49	133.46	-0.77	RYAAY ahead
2025-10-06	104.41	131.81	-0.57	RYAAY ahead
2025-10-03	102.62	130.97	-0.62	RYAAY ahead
2025-10-02	102.29	132.01	-0.68	RYAAY ahead
2025-10-01	100.56	130.00	-0.70	RYAAY ahead
2025-09-30	101.70	132.56	-0.74	RYAAY ahead
2025-09-29	103.33	127.38	-0.46	near the usual relationship
2025-09-26	102.51	127.21	-0.50	RYAAY ahead
2025-09-25	101.68	124.98	-0.45	near the usual relationship
2025-09-24	103.42	124.79	-0.36	near the usual relationship
2025-09-23	105.29	125.31	-0.29	near the usual relationship
2025-09-22	105.54	121.48	-0.13	near the usual relationship
2025-09-19	107.10	122.80	-0.11	near the usual relationship
2025-09-18	106.58	124.92	-0.22	near the usual relationship
2025-09-17	105.41	126.79	-0.35	near the usual relationship
2025-09-16	103.69	127.25	-0.45	near the usual relationship
2025-09-15	104.70	127.93	-0.42	near the usual relationship
2025-09-12	107.29	129.17	-0.35	near the usual relationship
2025-09-11	108.32	131.68	-0.40	near the usual relationship
2025-09-10	110.02	129.36	-0.23	near the usual relationship
2025-09-09	108.75	131.45	-0.36	near the usual relationship
2025-09-08	110.68	131.65	-0.28	near the usual relationship
2025-09-05	109.64	133.19	-0.38	near the usual relationship
2025-09-04	108.51	132.71	-0.42	near the usual relationship
2025-09-03	109.80	136.67	-0.50	RYAAY ahead
2025-09-02	109.55	134.27	-0.42	near the usual relationship
2025-08-29	110.72	139.71	-0.57	RYAAY ahead
2025-08-28	111.06	139.29	-0.54	RYAAY ahead
2025-08-27	109.78	137.97	-0.55	RYAAY ahead
2025-08-26	109.59	145.17	-0.81	RYAAY ahead
2025-08-25	108.26	144.20	-0.84	RYAAY ahead
2025-08-22	110.56	146.86	-0.83	RYAAY ahead
2025-08-21	103.66	143.36	-1.03	RYAAY ahead
2025-08-20	105.82	143.89	-0.95	RYAAY ahead
2025-08-19	108.42	145.45	-0.88	RYAAY ahead
2025-08-18	109.48	144.57	-0.81	RYAAY ahead
2025-08-15	107.96	146.67	-0.95	RYAAY ahead
2025-08-14	105.66	144.93	-1.00	RYAAY ahead
2025-08-13	106.49	144.77	-0.96	RYAAY ahead
2025-08-12	104.73	144.16	-1.02	RYAAY ahead
2025-08-11	95.88	140.15	-1.33	RYAAY ahead
2025-08-08	96.13	141.78	-1.38	RYAAY ahead
2025-08-07	96.11	142.64	-1.42	RYAAY ahead
2025-08-06	96.99	142.22	-1.37	RYAAY ahead
2025-08-05	94.75	140.00	-1.41	RYAAY ahead
2025-08-04	94.12	140.37	-1.47	RYAAY ahead
2025-08-01	91.67	136.74	-1.49	RYAAY ahead
2025-07-31	95.36	137.07	-1.31	RYAAY ahead
2025-07-30	96.06	136.47	-1.25	RYAAY ahead
2025-07-29	97.67	138.41	-1.25	RYAAY ahead
2025-07-28	99.66	138.01	-1.14	RYAAY ahead
2025-07-25	98.32	140.41	-1.31	RYAAY ahead
2025-07-24	98.05	137.84	-1.24	RYAAY ahead
2025-07-23	100.32	137.57	-1.11	RYAAY ahead
2025-07-22	99.77	135.84	-1.08	RYAAY ahead
2025-07-21	100.43	131.76	-0.88	RYAAY ahead
2025-07-18	100.88	123.60	-0.52	RYAAY ahead
2025-07-17	100.97	127.76	-0.69	RYAAY ahead
2025-07-16	99.57	128.95	-0.81	RYAAY ahead
2025-07-15	99.84	126.63	-0.70	RYAAY ahead
2025-07-14	104.14	126.44	-0.47	near the usual relationship
2025-07-11	101.52	126.50	-0.61	RYAAY ahead
2025-07-10	101.76	128.31	-0.67	RYAAY ahead
2025-07-09	90.86	127.36	-1.22	RYAAY ahead
2025-07-08	90.54	129.52	-1.34	RYAAY ahead
2025-07-07	89.61	128.31	-1.35	RYAAY ahead
2025-07-03	91.15	127.23	-1.22	RYAAY ahead
2025-07-02	89.84	128.26	-1.35	RYAAY ahead
2025-07-01	87.81	126.96	-1.43	RYAAY ahead
2025-06-30	88.14	126.94	-1.42	RYAAY ahead
2025-06-27	88.87	125.45	-1.32	RYAAY ahead
2025-06-26	87.76	126.15	-1.42	RYAAY ahead
2025-06-25	86.58	123.75	-1.40	RYAAY ahead
2025-06-24	88.82	125.73	-1.36	RYAAY ahead
2025-06-23	86.47	121.02	-1.31	RYAAY ahead
2025-06-20	84.59	121.00	-1.44	RYAAY ahead
2025-06-18	85.23	121.66	-1.43	RYAAY ahead
2025-06-17	84.80	121.18	-1.45	RYAAY ahead
2025-06-16	88.64	123.79	-1.33	RYAAY ahead
2025-06-13	84.30	121.55	-1.52	RYAAY ahead
2025-06-12	87.60	124.01	-1.43	RYAAY ahead
2025-06-11	88.12	126.37	-1.51	RYAAY ahead
2025-06-10	92.62	127.32	-1.28	RYAAY ahead
2025-06-09	91.76	126.79	-1.32	RYAAY ahead
2025-06-06	91.31	125.86	-1.31	RYAAY ahead
2025-06-05	87.53	122.98	-1.42	RYAAY ahead
2025-06-04	87.78	122.17	-1.38	RYAAY ahead
2025-06-03	87.51	121.75	-1.38	RYAAY ahead
2025-06-02	86.92	124.92	-1.58	RYAAY ahead
2025-05-30	86.72	122.39	-1.49	RYAAY ahead
2025-05-29	86.92	123.20	-1.52	RYAAY ahead
2025-05-28	87.10	124.63	-1.59	RYAAY ahead
2025-05-27	88.53	124.13	-1.48	RYAAY ahead
2025-05-23	85.88	123.33	-1.63	RYAAY ahead
2025-05-22	86.92	121.48	-1.48	RYAAY ahead
2025-05-21	86.51	121.18	-1.51	RYAAY ahead
2025-05-20	89.57	119.06	-1.21	RYAAY ahead
2025-05-19	91.74	118.80	-1.06	RYAAY ahead
2025-05-16	91.25	110.06	-0.64	RYAAY ahead
2025-05-15	90.11	110.94	-0.76	RYAAY ahead
2025-05-14	90.65	111.45	-0.75	RYAAY ahead
2025-05-13	94.96	109.75	-0.39	near the usual relationship
2025-05-12	91.65	109.18	-0.56	RYAAY ahead
2025-05-09	86.63	109.62	-0.92	RYAAY ahead
2025-05-08	86.99	111.78	-1.01	RYAAY ahead
2025-05-07	81.18	111.89	-1.43	RYAAY ahead
2025-05-06	80.30	110.79	-1.43	RYAAY ahead
2025-05-05	81.56	110.85	-1.35	RYAAY ahead
2025-05-02	79.21	109.80	-1.46	RYAAY ahead
2025-05-01	74.37	106.21	-1.64	RYAAY ahead
2025-04-30	74.61	105.35	-1.58	RYAAY ahead
2025-04-29	75.41	103.98	-1.44	RYAAY ahead
2025-04-28	75.20	101.28	-1.30	RYAAY ahead
2025-04-25	74.52	101.87	-1.38	RYAAY ahead
2025-04-24	75.30	102.11	-1.33	RYAAY ahead
2025-04-23	74.19	102.16	-1.42	RYAAY ahead
2025-04-22	72.29	101.23	-1.52	RYAAY ahead
2025-04-21	70.73	98.50	-1.48	RYAAY ahead
2025-04-17	73.21	100.55	-1.40	RYAAY ahead
2025-04-16	72.74	99.45	-1.37	RYAAY ahead
2025-04-15	73.17	99.21	-1.31	RYAAY ahead
2025-04-14	72.22	97.93	-1.31	RYAAY ahead
2025-04-11	73.26	97.18	-1.17	RYAAY ahead
2025-04-10	70.54	93.42	-1.15	RYAAY ahead
2025-04-09	79.34	96.61	-0.66	RYAAY ahead
2025-04-08	64.30	87.30	-1.27	RYAAY ahead
2025-04-07	66.83	86.31	-0.97	RYAAY ahead
2025-04-04	66.76	88.27	-1.10	RYAAY ahead
2025-04-03	69.37	92.28	-1.12	RYAAY ahead
2025-04-02	77.72	94.65	-0.62	RYAAY ahead
2025-04-01	76.02	93.92	-0.69	RYAAY ahead
2025-03-31	78.14	93.26	-0.49	near the usual relationship
2025-03-28	78.57	95.58	-0.59	RYAAY ahead
2025-03-27	82.71	99.60	-0.52	RYAAY ahead
2025-03-26	86.15	99.96	-0.31	near the usual relationship
2025-03-25	87.22	100.20	-0.25	near the usual relationship
2025-03-24	87.60	101.52	-0.29	near the usual relationship
2025-03-21	83.82	101.65	-0.52	RYAAY ahead
2025-03-20	84.14	103.15	-0.57	RYAAY ahead
2025-03-19	85.57	103.96	-0.51	RYAAY ahead
2025-03-18	82.29	103.68	-0.69	RYAAY ahead
2025-03-17	84.03	105.24	-0.65	RYAAY ahead
2025-03-14	83.78	104.12	-0.60	RYAAY ahead
2025-03-13	78.71	102.14	-0.82	RYAAY ahead
2025-03-12	81.18	102.20	-0.65	RYAAY ahead
2025-03-11	83.66	103.28	-0.54	RYAAY ahead
2025-03-10	90.20	103.79	-0.18	near the usual relationship
2025-03-07	95.48	106.41	-0.02	near the usual relationship
2025-03-06	98.49	105.19	+0.20	near the usual relationship
2025-03-05	101.74	110.24	+0.14	near the usual relationship
2025-03-04	98.01	102.51	+0.31	near the usual relationship
2025-03-03	104.75	106.27	+0.47	near the usual relationship
2025-02-28	107.74	106.82	+0.58	DAL ahead
2025-02-27	107.08	105.13	+0.64	DAL ahead
2025-02-26	110.57	103.92	+0.85	DAL ahead
2025-02-25	110.73	100.37	+1.03	DAL ahead
2025-02-24	110.20	99.74	+1.04	DAL ahead
2025-02-21	107.53	99.41	+0.95	DAL ahead
2025-02-20	114.25	100.22	+1.20	DAL ahead
2025-02-19	116.56	98.15	+1.40	DAL ahead
2025-02-18	115.30	100.18	+1.26	DAL ahead
2025-02-14	117.19	99.80	+1.37	DAL ahead
2025-02-13	114.80	100.48	+1.25	DAL ahead
2025-02-12	118.87	100.48	+1.42	DAL ahead
2025-02-11	116.04	99.05	+1.38	DAL ahead
2025-02-10	118.62	99.93	+1.45	DAL ahead
2025-02-07	122.11	101.28	+1.53	DAL ahead
2025-02-06	121.72	103.10	+1.45	DAL ahead
2025-02-05	123.76	103.17	+1.53	DAL ahead
2025-02-04	123.76	103.70	+1.52	DAL ahead
2025-02-03	119.14	102.03	+1.43	DAL ahead
2025-01-31	120.56	102.77	+1.46	DAL ahead
2025-01-30	122.89	106.05	+1.42	DAL ahead
2025-01-29	122.63	102.99	+1.55	DAL ahead
2025-01-28	121.24	104.38	+1.45	DAL ahead
2025-01-27	121.45	101.74	+1.59	DAL ahead
2025-01-24	120.39	101.56	+1.57	DAL ahead
2025-01-23	120.88	100.22	+1.66	DAL ahead
2025-01-22	121.47	97.27	+1.84	DAL ahead
2025-01-21	122.47	96.46	+1.93	DAL ahead
2025-01-17	117.96	91.68	+2.01	DAL ahead
2025-01-16	118.60	91.44	+2.07	DAL ahead
2025-01-15	117.38	93.07	+1.97	DAL ahead
2025-01-14	118.80	93.86	+2.01	DAL ahead
2025-01-13	116.67	92.19	+2.03	DAL ahead
2025-01-10	119.98	94.56	+2.07	DAL ahead
2025-01-08	110.07	97.95	+1.51	DAL ahead
2025-01-07	109.64	99.03	+1.45	DAL ahead
2025-01-06	107.60	94.96	+1.58	DAL ahead
2025-01-03	105.73	94.10	+1.55	DAL ahead
2025-01-02	105.86	94.45	+1.56	DAL ahead
2024-12-31	108.42	95.95	+1.61	DAL ahead
2024-12-30	108.82	96.72	+1.60	DAL ahead
2024-12-27	109.78	97.01	+1.65	DAL ahead
2024-12-26	111.83	96.68	+1.77	DAL ahead
2024-12-24	112.11	97.40	+1.76	DAL ahead
2024-12-23	110.25	96.98	+1.72	DAL ahead
2024-12-20	109.19	98.39	+1.62	DAL ahead
2024-12-19	108.21	97.93	+1.61	DAL ahead
2024-12-18	105.52	97.12	+1.54	DAL ahead
2024-12-17	108.98	100.00	+1.57	DAL ahead
2024-12-16	109.41	98.46	+1.68	DAL ahead
2024-12-13	110.25	100.04	+1.66	DAL ahead
2024-12-12	110.45	100.31	+1.67	DAL ahead
2024-12-11	113.76	101.25	+1.79	DAL ahead
2024-12-10	112.49	101.85	+1.72	DAL ahead
2024-12-09	111.58	101.06	+1.74	DAL ahead
2024-12-06	115.65	102.69	+1.86	DAL ahead
2024-12-05	117.87	103.15	+1.95	DAL ahead
2024-12-04	115.16	97.75	+2.14	DAL ahead
2024-12-03	112.13	98.02	+2.01	DAL ahead
2024-12-02	113.64	97.34	+2.14	DAL ahead
2024-11-29	114.37	96.94	+2.23	DAL ahead
2024-11-27	114.01	96.54	+2.26	DAL ahead
2024-11-26	114.95	95.36	+2.41	DAL ahead
2024-11-25	115.57	96.39	+2.41	DAL ahead
2024-11-22	113.51	94.61	+2.45	DAL ahead
2024-11-21	113.51	94.39	+2.50	DAL ahead
2024-11-20	114.05	96.72	+2.43	DAL ahead
2024-11-19	116.04	99.10	+2.43	DAL ahead
2024-11-18	113.33	98.50	+2.37	DAL ahead
2024-11-15	114.82	98.77	+2.47	DAL ahead
2024-11-14	116.22	99.23	+2.55	DAL ahead
2024-11-13	115.52	98.13	+2.62	DAL ahead
2024-11-12	114.78	100.09	+2.51	DAL ahead
2024-11-11	113.91	102.03	+2.39	DAL ahead
2024-11-08	109.41	100.55	+2.27	DAL ahead
2024-11-07	108.30	104.12	+2.03	DAL ahead
2024-11-06	111.68	100.99	+2.43	DAL ahead
2024-11-05	104.46	101.89	+2.00	DAL ahead
2024-11-04	101.95	96.98	+2.18	DAL ahead
2024-11-01	104.64	100.24	+2.17	DAL ahead
2024-10-31	102.54	97.42	+2.25	DAL ahead
2024-10-30	104.77	98.79	+2.33	DAL ahead
2024-10-29	102.76	98.22	+2.28	DAL ahead
2024-10-28	99.25	100.00	+1.96	DAL ahead
2024-10-25	96.99	99.19	+1.88	DAL ahead
2024-10-24	98.15	98.15	+2.06	DAL ahead
2024-10-23	97.94	99.52	+1.97	DAL ahead
2024-10-22	98.21	100.40	+1.96	DAL ahead
2024-10-21	98.75	99.27	+2.09	DAL ahead
2024-10-18	100.00	100.00	+2.16	DAL ahead

One-day company-specific moves (4+ standard deviations, which block ideas for 10 sessions): Jan 10, 2025 (DAL +9.0%, RYAAY -3.5%); Apr 9, 2025 (DAL +23.4%, RYAAY +10.7%). Upcoming earnings: RYAAY Nov 2, 2026 (pre-market).

Paired trades

The shared paper book and the replay, kept apart

Forward paper record

No paper position on this pair yet.

Historical simulation (a diagnostic, same rules)

1 simulated trade to Oct 20, 2026: +13.47% per trade on average after costs, 1 won.

Legs	Entered	Exited	Why	Days	Before costs	Costs + borrow	After costs
Long RYAAY · Short DAL	Apr 7, 2021	May 5, 2021	converged	28	$1,412.83	-$57.04	$1,347.03 (+13.47%)

Per $10,000 a leg. A replay on today's companies cannot prove an edge.

The companies

DAL and RYAAY at a glance

DAL Delta Air Lines Inc.

Listing: NYSE · SEC CIK 27904
Industry: Air Freight/Delivery Services · SIC 4512 Air Transportation, Scheduled
Market value: $49.1B
Price history: 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026

RYAAY Ryanair Holdings plc

Listing: Nasdaq · SEC CIK 1038683
Industry: Air Freight/Delivery Services · SIC 4512 Air Transportation, Scheduled
Market value: $27.6B
Price history: 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026

Daily prices: Nasdaq.com. Filings and industry codes: SEC EDGAR. Earnings dates: Nasdaq earnings calendar.

All pairs →

Pair	Status	Ahead now	Industry
DAL / UAL	Watchlist	DAL by 1.58 sd	Air Freight/Delivery Services
UAL / RYAAY	Watchlist	UAL by 0.71 sd	SIC 4512 Air Transportation, Scheduled
FDX / DAL	Watchlist	neither	Air Freight/Delivery Services

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Paper only: hypothetical paired positions with modelled costs. No broker, no orders, no real money. A historical simulation is a diagnostic, not proof of an edge. Not investment advice.