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.

Delta Air Lines and United Airlines have been sued by passengers who claim they were charged extra for a window seat but found themselves sitting next to a blank wall. The lawsuits, filed separately against the US carriers, seek millions of dollars in damages for more than a million customers of each airline.