I was in the same boat as you. In my five airline applications, I listed all formal training busts: UPT, IFF, FTU, and WIC.

I was generic in the applications, but also ready to discuss details in the interview (although I sure as hell don't remember most of my many WIC busts). Interview invites to four airlines (i.e., did not seem to affect the calculus on getting an interview at any of these).