I would recommend searching other threads on this forum about ATP before deciding to pull the trigger on that option. I would take a look at part 141 schools near you, and take a look at pricing and whatnot to compare to ATP. It is important to remember that training can be as "accelerated" as you like, but it may benefit you to learn at a flight school that does not have as rigid of a schedule, and allows you to progress as the pace you are learning. I have read that ATP will recommend check rides to students before they are ready, which can cause a potentially costly bust on your record that may prohibit a call from a legacy.