But critics claim their new move ends up making the airline more money.
It's called the Flex-Schedule program. Ahead of your flight, United will ask how flexible you are.
Video: Passenger is dragged off overbooked United flight
If the airline thinks your ticket is a hot commodity, you may get an offer to change your itinerary and they'll give you $250.
If you accept, you'll be re-booked within 24 hours, but here's where the plan is raising eyebrows.
United can then resell your seat at a higher price to business travelers.
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