This is as of OCT 25. The latest data from DOT BTS. In SEA.

• #1 ALK 47.87%
• #2 DAL 19.50%

I would call that a pretty wide margin. Could be wrong. Of you add the in feeders, its even more pronounced. In BOS it's

• #1 JBLU 27.38%
• #2 DAL 21.48%

Doesn't include feeders. In AUS

• #1 SWA 42.66%
• #2 AAL 15.52%
• #3 DAL 15.25%

https://www.transtats.bts.gov/Homepage.asp