In the airline contracts I have seen, Force Majeure would only get the COMPANY out of the contract, never the pilot.
Also airlines have gotten more creative in the application of force majeure...it used to obviously apply only to things like hurricanes, earthquakes, war, etc. Now some companies consider any business circumstance that doesn't go their way to be force majeure, thereby freeing them from their obligations to labor.
Too many pilots up and quit? Force Majeure! Cancel the contractual work rules and vacations for the remaining pilots!