Delta Airlines is switching its frequent flyer program entirely to spending on its American Express Card. No miles for flights. Delta gets an astounding $7 billion from American Express from sales of miles, ancillary fees and brand fees. Its goal is $10 billion which would be what it made from tickets for flights in 2022. Delta's CEO says it may have gone too far with these changes which are unpopular with its flyer base except for the high end flyers who disliked crowded lounges. Were there other ways to tackle that problem? Delta appears to have shifted attention to a small fraction of its customers.