If I had my time again, and was offered APP while at Uni, I'm afraid to say it, but I'd give up Uni. Everyone and their mother goes to Uni these days, and I'm not sure what it gives young undergraduates today. I did both undergraduate and a masters, spending a grand total of five years at Uni!
You can always go back to Uni, and as a mature student, it will probably be more worthwhile. Why pay for two years for something when, first your heart isn't in it, second, your just building up more debt.
If flying is the career for you, don't hesitate, they'll be wasted years. Take the chances life gives you.