Originally Answered: which is the best flight school in the world?
I think you are looking for a school that has such a great reputation for quality that graduating from it will greatly increase your chances of getting a job. However, with the exception of the military, no such flight schools exists. It's not like there is one school that just stands out from the rest. Your certificates are the same no matter what school you go to.
Most flight schools in your local area will offer very fine quality training at a reasonable price. There isn't any advantage to going to one of the university programs, especially if you already have a degree. I recommend shopping around in your area and picking the school you like the best. You can find flight school listings here:
The following sites have some pretty good discussions about the things you should consider when picking a flight school. A couple of them are from a site about helicopters, but the parts about picking a good school are still the same.
One other thing to mention here. When you do your initial training (Private, Instrument, Commercial, Instructor, etc) you will be in small aircraft. Once you have finished your initial training, you do not jump into a 747 right away, nor do you just pay for another flight school to train you in it. When you finish primary training you will have about 250-300 hours. At that point you will likely build experience by instructing or doing light commercial work in small aircraft. You only get into the largest aircraft with several years of experience. It's not like you just go to a flight school and when you finish you're an airline captain.
Lover not a Fighter posted this site recently and I think it explains the process pretty well:
Do your homework, shop around, get many sources of information, and evaluate every possible path before you begin.