This has been an EXCELLENT discussion of a very important subject, and my compliments to all the posters here.
This discussion emphasizes a couple of things that EVERY potential student pilot should consider:
1) There are MANY different paths to a PPL. It behooves you to examine as many as possible, and choose the one that seems to fit YOUR situation best. This discussion is a good resource for doing that. I'd suggest Zane archive it somehow for that purpose, as a reference.
2) There is as much MIS-information out there regarding flight training as there is GOOD information. So be it. As with anything else in life: Buyer beware. There are good schools, and there are not so good schools. DO THE HOMEWORK. Ask any school that you are considering for REFERENCES of past students, as in a LIST of all their students, not just their super stars. Call a few, and get their feedback.
3) Learning to fly is expensive. I'm not a millionaire, but even if I were, learning to fly would be expensive in this day and age. But it can be done, even by people of moderate means.
4) Learning to fly and flying is all about a passion for this activity. People who are truly passionate about flying will figure out a way to get there, and these are the people we need in aviation today, more than ever.
5) Buying your own airplane to learn in is a great idea, IF you buy a good airplane. That can take money up front, but even if you sell it after you get your certificate, if its' a good plane, you should recoup most of the initial cost of the plane. Choose wisely, however.
6) You do not have to be Charles Lindberg to fly safely and enjoy flying. Heck, even I can fly

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a64: Not sure what your question is regarding LSA. A sport pilot certificate qualifies one only to fly LSA aircraft, whereas a PPL can fly an LSA aircraft. More specifics, por favor.
It is (theoretically, at least) possible to complete a Sport Pilot certificate in 20 hours total time. I think that completion time will depend greatly on the type of SLSA.
MTV