The union representing flight attendants with American Airlines warned Boeing that 28,000 members would refuse to work on unsafe aircraft amid concerns about the safety of the company's jets.
"The 28,000 flight attendants working for American Airlines refuse to board an aircraft that may not be safe and require the highest possible safety standards to avoid another tragedy," Lori Bassani, president of the Association of Professional Flight Attants, wrote in a letter to Boeing CEO Dennis Muilenburg.
The letter was written in response to Muilenburg's testimony this week before Congress regarding two recent Boeing 737 MAX crashes that killed 346 people. Muilenburg told lawmakers that the 737 production line was operating at a "high speed" at the time of the first crash in October 201
The union stated that the witness statement made it clear that "there were serious crashes in the 737 MAX oversight," and that the Federal Aviation Administration was concerned about having the resources necessary to conduct strong enough oversight.
"I know after two days of very tough hearings you understand the deep concerns that remain about the 737 MAX relaunch," Bassani wrote. "The effort cannot be higher. Our lives are not for sale."
Boeing stands facing a snow avalanche of congressional scrutiny of the plane and whether it is safe to fly again. However, it announced last month that it expects to return the 737 MAX to service on January 16.