Originally Posted by
uavking
^^This. It is generally accepted practice in the industry that if the contract dictates positive space travel (training, DH to operate, etc.), you do not take the jumpseat. If the company wants to overbook, and has to buy off a revenue passenger as a result, that's their problem. Do not let a gate agent try to pull a fast one on you and talk you into giving up your contractual seat.
I have not had to do this while on an A pass of any kind, but I have taken the JS several times while commuting on an RJ and it made the difference to a flight attendant getting a ride. For any other revenue or non rev, I wouldn’t do it.