Bloomberg reports that the union representing Southwest's pilots has asked a court to grant a temporary stay against the federal vaccination rules until an ongoing lawsuit over what they allege are violations of US labor laws is resolved. 

In a court filing on Friday, the Southwest Airlines Pilots Association also asked for an immediate hearing on the request before a federal court in Dallas, claiming the carrier has continued to take unilateral actions that violate terms of the Railway Labor Act, which governs relations between airlines and employee unions. The "unilateral action" in question is the company's attempt (at the Biden Administration's direction) to force workers to either get the jab, or be fired or sent on unpaid leave, Bloomberg reports.

"The new vaccine mandate unlawfully imposes new conditions of employment and the new policy threatens termination of any pilot not fully vaccinated by December 8, 2021," the legal filing said. "Southwest Airlines' additional new and unilateral modification of the parties' collective bargaining agreement is in clear violation of the RLA."

According to the guidelines set out by President Biden (and "voluntarily" embraced by most of the major airlines), Southwest has a deadline of Oct. 4 under the federal mandate for employees to get jabbed or have an approved medical or religious exemption. SW is affected by the mandate because it has contracts with the federal government (like many large businesses).