In switches defense, There is/was some sort of bug that can award you that many kills for only shooting down 1 plane, however I'm not sure what the requirements are for that to happen. It happened to me not too long ago, I got 5 kills, three of which were bombers, but the second bomber I shot down awarded me 16 kills
I ended up landing 20. Laughed about it real hard for a good 15 mins all while getting flamed in a PM from someone about that looking "Ridiculous"
I still have the video. I thought it was an isolated incident but maybe it wasn't. Perhaps I should send the video in to HTC.
EDIT: AND the planes he killed were Lancasters, which conforms to my situation too. Looks like it may have been the same thing that happened to me.