I recently did ATP training with Accessible Aviation nearby Columbus AFB, MS. I did the ATP written test ($150) at a local testing center after studying on my own with Sheppard Air software ($75). Then I went to Accessible Aviation. I took two flights in a Seneca on a Saturday, one flight on Sunday morning, and the check ride Sunday afternoon. The oral quiz lasted about 1.5 hours, and the checkride was 2.5 hours. Carl Nuzzo is the owner and, most likely, will be the one to instruct you. He is also a part-time sim instructor for the T-6's at the base. I think that the program was thorough and Carl gave the best training a military pilot can ask for. It cost $2500 (includes lodging and examiner fee).