Originally Posted by
Mudfish
You need to keep a decent amount of F seats to keep your frequent fliers from running to the competition as well. Frequent upgrades has kept me loyal to US. If I was flying in the back of the bus I'd be bargain hunting instead.
That and the fact that foreign travellers need domestic service while in the US. People used to flying whatever amounts to domestic business class while overseas will pay for and book domestic F here.