The grounding in mid-March following two fatal crashes of the jet has run up legal fees for the Southwest Airline Pilots Association, which has had to comply with records requests as part of the Justice Department's investigation. Pilots have also lost wages over the last three months since the Federal Aviation Administration and other regulatory agencies said the Max cannot fly.
The pilots' union says it will be "seeking compensation and reimbursement from Boeing for every dollar legally available to be challenged, when the Max issues are resolved." The union hasn't said exactly how much the grounding of the Max has cost pilots. A person familiar with the matter estimates Southwest pilots lose $8.5 million per month not flying the Max.
Southwest was the launch airline for the 737 Max and has 34 of them in its fleet, the most of any airline in the world. The airline recently pushed back the date when it plans to resume Max flights to Sept. 2. While that date was set by the airline's management, the airline's pilots union says "there is no accurate estimate of when the Max will return to service."
At the Paris Air Show this week, Boeing CEO Dennis Muilenburg told CNBC he will not give a target date for the return of the Max, largely because it is unclear how long it will take regulatory agencies to recertify the plane. "We'll get it back in the air when it's safe. That is the most important thing here," said Muilenburg.