Looking at Up In The Air, you'd think that most Americans flying would do anything for frequent flyer miles.
63% of Americans do not have an airline they prefer to fly and only 5% consider getting frequent flier miles to be the most important consideration when selecting a flight.
One thing matters: price.
Americans are annoyed by high ticket costs, bag fees, charges for food, etc. And I'm pretty sure that's the same everywhere around the world.