United Airlines

Videos show a man on an overbooked flight wrenched from his seat and dragged down the aisle, to other passengers' horror. United's CEO apologized for having to "re-accommodate these customers."

All three of the biggest U.S. airlines now offer no-frills, discounted fares called "basic economy." Now there's evidence that it's not any cheaper, but is a way to raise standard economy fares.

Beset by a record of flight delays, dismal passenger satisfaction and widespread tech glitches, the nation's second-largest airline is seeking ways to restore customer confidence and employee morale.