Totally agree with RW-1, 21st Century Jet was an excellent series of progs.
I can also remember the Diamonds in the Sky series, thought that was brilliant and Skytrucker, all about CargoLion was another excellent programme.
The problem with programmes on Discovery Wings is that they are repeated an awful lot, I suppose that gives people ample opportunity to watch them, personally it drives me round the twist.
Come on Discovery, give us some new programmes!!