Delta Air Lines and United Airlines were sued on Tuesday by passengers who claimed they paid extra money to sit in “window” seats, only to find themselves placed in seats next to a blank wall.

United and Delta Airlines are being sued by passengers who say they paid extra for window seats — only to be seated next to a barren wall during their flight. The proposed class action lawsuits, filed in federal courts Tuesday seek millions of dollars in damages for over one million customers who rode on each airline.