Barclaycard has upped the signup bonus on their AAdvantage Aviator Red MasterCard to 60,000 miles after first purchase (annual fee is not waived first year).
They’re also experimenting with a new program that lets you earn miles faster. I logged into my account today — I have an Aviator Silver card that lets you earn elite qualifying miles for spend, you can’t apply directly for it but have to upgrade an Aviator Red — and found an offer for a new program they’re testing.