I've had Discovery Wings for a few years now, and they really do have very few new programmes. I think I've watched everything they have by now.
The best thing they did was a few months ago with "Archive Weekend" where they just showed back-to-back old aviation documentaries and shorts from the 40's 50's and 60's.
It's a very low-cost channel, probably a staff of 2 or 3, created basically to pad out the number of channels Discovery can claim to put out.