Thousands of employees volunteered for buyouts, early retirement or long-term leave during the pandemic. And the airline has had to bring on new employees to replace those departed workers to meet the demand, Mr. Jordan added.
“I’ve been at the airline for 33 years,” he said. “Constraints have always been, can you get aircraft, can you get airports, facilities, gates? This is the first time where the constraint is staff.”
The union also said in a statement on Sunday that its members are barred by federal law from using a strike to resolve a labor dispute without exhausting other options first.
While the union, which says it does not oppose vaccination, denied that its members were calling in sick to protest the mandate, it did ask a judge on Friday to stop the airline from enacting the vaccine mandate and other policies. The request is part of a broader lawsuit that predates…

