Dear Franklyn,
If your answer also applies to the pilots that attended, I think something has gone wrong with your communications.
Like Flyingprincess - nothing heard since interview (it isn't in spam either). However a couple of days ago a friend (who was not invited to interview) got a "you were not successful" email.... think he'd already worked that out for himself, having not been asked to interview!
Maybe your staff have emailed the "not called to interview" candidates as opposed to "attended interview but not successful".
Anyway I think by now everybody has got the message despite no email.