I know that the R101 was civvy "G" registered but she was flying the RAF Ensign when she crashed (which now hangs in the local church at Carddington). The majority of the senior crew were serving RAF including I believe the skipper and navigator; the R101 was owned by the Govt and I guess it could draw parallels with the civvy reg aircraft the RAF operate these days?
Tragic story the R101 and was a series of high profile airship losses in the 30s, the most famous being Hindenburg. Let's hope we don't learn them all over with the current Hybrid Air Vehilces venture at Cardington these days
LJ