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.

The filing against Delta, which is available online from Courthouse News, claims that the number of people affected could be over a million:

United and Delta charge hundreds of dollars for such seats and make no mention that they are without windows. Meanwhile, their competitors, American and Alaska Airlines, inform their customers that these types of seats do not have a window while booking, Reuters reported.