Regardless if you can hook up with a trainer on a individual day the important thing that matters hlbly is that good things happen in the TA regardless of whos in there. Its the one place where folks are only focused on improving and theres no scoring, no HO'ing, no smack talking. There have been a lot of days where Ive simply gone in there and taken 1/2 dozen airplanes up just to turn in circles and learn their stall limits and behavior. There have been plenty of days where Ive taken bombers up and just practiced gunnery, plenty of days where Ive gone in there and tried new things that popped up in my head at work, or, I read about.
Because in the end its not going to be the trainer who makes you a good stick. Its going to be YOU who makes you a good stick and the TA is the best training resource in the game.
There's always others in there you can fly against and every minute you can spend in a AH war plane you are also going to be training. Even better there is usually someone better then you in there to fly against. Which will help you grow. I myself should spend more time in there rather then grab-arseing around the MAs. I'd be a better stick if I did.
Every minute your in the TA has value. With, or without a trainer, you shouldn't squander it.