A Delta Airlines Boeing 757-251 approaches Washington Ronald Reagan National Airport (DCA) in Arlington, Virginia on February 24, 2021.Daniel Slim | AFP | Getty ImagesTravelers are returning to the skies, fueling optimism among airline CEOs that the battered industry has turned a corner in the coronavirus pandemic.The Transportation Security Administration screened more than 1.34 million people on Sunday, 86,000 more people than the same day a year ago, shortly after the World Health Organization declared Covid-19 a pandemic.That figure was still 45% below 2019 levels, a sign the industry still has a long way to go before recovering to pre-pandemic levels. But TSA screenings have …
