DAL +46.9%. Southwest Airlines +30.6%, United Airlines +18.0%, American Airlines +11.7%, Alaska Air −19.6%. Weekly closes, Oct 3, 2025 = 100, log scale.

End-of-day closes (Databento EOD), the last close of each week. The four peers are the largest US-listed companies by market value in DAL’s SEC industry (Air Transportation, Scheduled) with a year of closes. It shows what the closes did; a move here is not a cause, a forecast or a call.