Delta Air Lines and United Airlines were hit with separate class-action complaints on 19 Aug. alleging that the carriers charge premium fees for “window” seats that lack actual windows. The lawsuits were filed in Brooklyn federal court against Delta and in San Francisco federal court against United and seek millions of dollars in damages on behalf of more than one million passengers at each airline. Lead plaintiffs Nicholas Meyer, Marc Brenman and Aviva Copaken say they paid extra—or used reward points—to secure seats advertised as window positions, only to find themselves beside a blank wall. The filings, brought by litigation boutique Greenbaum Olbrantz, claim the practice affects seats on Boeing 737, Boeing 757 and Airbus A321 jets where air-conditioning ducts or other components block the window. Alaska Airlines and American Airlines flag such seats during booking, the suits note, but Delta and United allegedly do not. According to the complaints, United can charge more than $50 on domestic routes and over $100 on international flights for window-seat selection, while Delta often requires travelers to pay an upgrade fee of about $40 and an additional seat fee exceeding $30. The plaintiffs argue the undisclosed charges constitute misrepresentation and breach of contract. Both airlines declined to comment, citing pending litigation, while industry analysts say ancillary fees such as seat assignments have become an increasingly important revenue stream for U.S. carriers.