FILE – In this April 1, 2020, file photo, several dozen Delta Air Lines jets are parked at Kansas City International Airport in Kansas City, Mo. A sign of the deepening slump in air travel with coronavirus cases rising across the country, Delta CEO Ed Bastian said Wednesday, Dec. 9, 2020, that Delta will need more employees to take unpaid leave “for the foreseeable future.” Unlike American and United, Atlanta-based Delta has avoided furloughs since the pandemic started by convincing thousands of workers to retire early or take unpaid leave. (AP Photo/Charlie Riedel, File)