The pilot union has taken a strike authorization vote, but isn’t legally permitted to strike because they haven’t received federal permission to do so (and that would only come after a 30 day ‘cooling off period’). Pilots are getting frustrated over the time it is taking to get to a contract, though the airline has publicly committed to substantial raises.
Some pilots do not want to wait, and are suggesting taking matters into their own hands. The mistake they’re making, though, is putting this in writing – and the union, therefore, has taken steps to disavow it.