The airline's "Clearance-to-Fly" procedure involves a screening conducted with the University of Pittsburgh Medical Center and STAT-MD, a physician service that provides consulting to airlines, according to Today.

Major U.S. airlines' policies about wearing masks and social distancing on flights vary.

American Airlines asks all passengers except children and those with medical exemptions to wear a mask on planes. And United has said passengers who won't wear a mask may be put on a restricted travel list.

Delta, Southwest, Jet Blue and Alaska have also enacted safe social distancing measures, such as leaving middle seats empty on their flights.

United Airlines never instituted a practice of leaving seats empty to allow for social distancing, while American Airlines has ended their previously instituted limited capacity rules as of July 1, despite the continued surge in new coronavirus cases in the U.S.

To date, there have been 4.6 million cases in the country and 154,000 people have died, according to the Centers for Disease Control and Prevention (CDC).

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