I'm at the Academy now. While here I'm making $11.80/hr. I'll gross somewhere over $900 (you can do that math easily), and I'm netting just under $600 after TSP contributions, Health Insurance, etc... Payday is every other Tuesday. Also, and this sounds weird but they explain it to you. You are taxed as a Washington DC resident, not OK or your home state.
Keep in mind you will also have your housing payed for. The FAA allocates $67/day now for housing per-diem and will pay that directly to the housing provider of your choice from their list. You will also receive $38.60/day in Meals and Incidentals per-diem (tax-free), payed out every month.
A classmate of mine did the math and when you include all per-diem it's somewhere in the $80k/year range. Pay based off of your paystub is nearly unlivable, but when you include the per-diem, it's not bad. You won't be living like a king (or a CPC), but you wont be eating Top Ramen everyday either.