FILE PHOTO: A United Airlines Boeing 777-200ER plane is towed as American Airlines Boeing 737 plane departs from O’Hare International Airport in Chicago, Illinois, U.S. November 30, 2018. REUTERS/Kamil Krzaczynski/File Photo
FILE PHOTO: A United Airlines Boeing 777-200ER plane is towed as American Airlines Boeing 737 plane departs from O’Hare International Airport in Chicago, Illinois, U.S. November 30, 2018. REUTERS/Kamil Krzaczynski/File Photo