Travelers wear mask as they wait at the American Airlines ticket counter in Terminal 3 at O'Hare International Airport Tuesday, June 16, 2020, in Chicago. Beginning June 16 at American Airlines and June 18 at United Airlines, all passengers and crew members will be required to wear masks to prevent the spread of the coronavirus. (AP Photo/Nam Y. Huh)FILE - In this March 31, 2020 file photo American Airlines planes are parked at Pittsburgh International Airport in Imperial, Pa. There will be no more attempt at social distancing on American Airlines flights. The airline said Friday, June 26, that it will start booking flights to full capacity next week. (AP Photo/Gene J. Puskar, file)
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Travelers wear mask as they wait at the American Airlines ticket counter in Terminal 3 at O'Hare International Airport Tuesday, June 16, 2020, in Chicago. Beginning June 16 at American Airlines and June 18 at United Airlines, all passengers and crew members will be required to wear masks to prevent the spread of the coronavirus. (AP Photo/Nam Y. Huh)