As someone who used the ASW service weekly to and from glasgow, I have to say I'm surprised.The flights were always busy with large numbers of Navy personnel using the service every week.The tickets were not cheap. And for the time I used the service wasn't diverted once.Some of my fellow passengers found the low level and often bumpy transit from plymouth to newquay a bit of a trial! there were never sick bags in the seat pockets.
There is also the Navy Dauphin helicopter which operates out of plymouth.