Going back to the "One Off Approvals" and the reciprocal arrangement. In the summer months TCA, Thomsonfly, and Monarch had/have an agreement whereby Tommy Cook covered the Greek Islands, Monarch did Mainland Spain, and Thomsonfly did the Balearics. Provided the Engineer had the required cover then the "one off" was implied and a quick chat between the various Maintrol departments was all that was required. Worked well for all concerned. I suspect that in this case all that was required was a quick phone call "do you know Bill Smith? has he got 757 B1?" etc.