The only UAV I'm aware of that used an air bag type system was Phoenix which also had a reputation as the most dogshit drone ever. Second only to Watchkeeper really, which is why you shouldn't let gunners design air vehicles.

The airbags were a retrofit though, the original design landed upside down with frangible wingtips and a weird spine like thing taking the impact. The sensor pod underneath was now on top and hopefully protected as that was the expensive bit. As long as you came down perfectly vertically though.

Turns out in the real world there's this thing called wind and in reality they ended up rolling over and over until wrecked.