Outraged flyers filed a class action lawsuit about the windowless window seats.

Two suits filed this week accuse the airlines of unfairly charging passengers extra fees for window seats that the carriers knew were adjacent to aircraft walls.

Delta and United are being sued over allegedly charging extra for seats next to a blank walls.

“They have quite literally sold customers a window seat without a window,” one lawyer representing the classes of airline passengers told Fortune.

A pair of federal lawsuits filed in San Francisco and New York accuse Delta Air Lines and United Airlines of charging premium fees for window seats next to blank walls.

Outraged flyers filed a class action lawsuit about the windowless window seats.