Firstly if 90% of OAA grads went to the airlines then we'd all be there with them. Remember what Benjamin Disraeli said ("Lies, damned lies, and statistics").
Also why don't you want to be an instructor? You should get into flying for the love of it not for the love of a 747, BA, nice uniform, whatever and instructing is flying and probably more fun than a 747 anyway (as you'll have more time actually flying rather than monitoring an autopilot). Personally I cannot wait to get my instructor rating and I'll be very happy to do that for quite a few years.