A British Airways plane comes in to land behind a tail fin at Heathrow Airport in London. On Friday, the head of the group that owns BA called for instituting an electronic health pass for passengers as the company announced steep losses due to COVID-19. Kirsty Wigglesworth/AP hide caption
A jetliner arrives at London's Heathrow Airport earlier this year. On Wednesday, the U.K.'s highest court reversed a ban on the airport's controversial plans for a third runway. Adrian Dennis/AFP via Getty Images hide caption
There's increasing emphasis on wearing masks while flying. How much protection do they offer against COVID-19? James D. Morgan/Getty Images hide caption
Dozens of Delta jets have been parked on the tarmac of the Birmingham-Shuttlesworth International Airport since last spring. The airline reported $5.4 billion in third quarter losses on Tuesday. Russell Lewis/NPR hide caption
An American Airlines plane lands at the Fort Lauderdale-Hollywood International Airport on July 16, 2020. Air traffic has rebounded a bit but it's way below pre-coronavirus levels. Joe Raedle/Getty Images hide caption
A flight attendant adjusts protective glasses. There has been little documentation about COVID-19 transmission on planes. Valentyn Ogirenko/Reuters hide caption
Many airlines now require passengers to wear masks to reduce the risk of COVID-19 spread — and are putting scofflaws on a no-fly list. Nicolas Economou/ NurPhoto via Getty Images hide caption
A man wearing a mask prepares to board a Southwest Airlines flight at Kansas City International airport in Kansas City, Mo. Southwest and American Airlines are tightening their mask requirements at the end of July by doing away with exemptions for travelers over the age of 2. Charlie Riedel/AP hide caption
United Airlines planes at Newark Liberty International Airport in Newark, N.J. Company executives call the COVID-19 pandemic the worst crisis in the airline's history. Seth Wenig/AP hide caption
Passengers are tested for COVID-19 at Beirut International Airport on July 1. Anwar Amro/AFP via Getty Images hide caption
An empty terminal at Chicago's O'Hare International Airport. The normally bustling check-in at the United Airlines terminal was eerily quiet on April 24. David Schaper/NPR hide caption
The Boeing headquarters is seen amid the coronavirus pandemic on April 29, in Arlington, Va. Boeing announced sweeping cost-cutting measures Wednesday after reporting a first-quarter loss of $641 million following the hit to the airline business from the coronavirus pandemic. Olivier Douliery/AFP via Getty Images hide caption
With the coronavirus outbreak taking hold in the U.S., thousands of flights have been canceled — but on Sunday, there were still 2,800 planes in the air, according to aviation site Flightradar.com Courtesy of Flightradar24.com hide caption