The answer is pretty much no. You can try to fly as much as possible at a flight school, but your instructor will not be there everyday, your plane of choice will not be available everyday, you will not go on long X-C all the time to get the hours out of the way like you do at ATP either. The longest part of your training will be the PPL because you start from scratch and you need an instructor with you pretty much the whole time. The others will take a while because you need to get so much X-C and Sim INST time, and you will either need a safety pilot for that, or pay an instructor $40/hour to sit there and look out for airplanes for you. It's not the actual training that takes so long, it's the logistics of it all. At ATP, you go in and just train all day. Sims, ground school, in the plane.. Nobody here denies they do what they advertise, it's the quality of the instruction that is in question. If you just want to pay alot and go straight to the regionals without paying your dues, ATP is the place for you. If you don't want to pay all that money, then expect to train alot longer than 5 months from PPL to CFI. It'll be well over a year probably. And ATP only has the 90 day thing AFTER you get your private. expect the private to take 3 months or so, and then another 3 months for ATP, at the soonest.