Once per flight sequence.... It was a reserve protection that was eroded away by the company. It wasn't the language that lost the arbitration but the fact that a Union member had taken it on his own to try to work a deal out with the company during the crafting of that language and was later told by the MEC to stop. That was all the arbitrator needed to say there may have been intent by the union to have this "unless no other reserves are available" put into the contract.