Airlines have been upcharging everything from assigned seats to carry-on bags. Customers are finally pushing back

Fed-up passengers filed lawsuits this week claiming that Delta and United sold ‘windowless’ window seats for an extra fee.

For years, some of the biggest airline companies in the U.S. have been increasingly relying on ancillary fees—like advanced seat assignments and carry-on bag costs—to meet their bottom lines. Now, passengers are getting sick of it.