Before the pandemic the American Airlines co-brand portfolio had the largest charge volume, but American, United and Delta were all over $100 billion annually. Delta now says they’re “approaching 1% of U.S. GDP” on their co-brand cards, which would be ~ $255 billion. Inflation helps, but it’s reasonable to think they’re suggesting they’re around $200 billion in annual charge volume on Delta Amex cards. Even if American and United are lagging Delta’s growth surely then these three airline co-brands are now taking a slice out of more than 2% of U.S. GDP.