United and Delta airlines are facing a pair of lawsuits brought by passengers who said they paid extra for a window seat, only to find themselves sitting against a blank wall.

The proposed class action lawsuits were filed Tuesday against United in San Francisco, California, federal court and Delta in Brooklyn, New York, federal court. Both cases seek millions in damages for more than a million passengers.

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The complaint claims that certain Boeing 737, Boeing 757 and Airbus A321 planes have blocked windows in some rows due to air conditioning ducts, electrical conduits, or other systems. However, while competitor airlines like American and Alaska Airlines flag these seat kinks during the booking process, Delta and United

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