Good question! Part 141 is very similar curriculum to Part 61 but it is a more structured regimen with essentially “pop quizzes” (called stage checks) along the way. The FAA reviews and approves the curriculum and associated completion standards. Thus the Part 141 school can advertise as an “FAA Approved” school. The benefis are slight reduction in training hours and (in theory) higher quality, standardized curriculum. Part 141 curriculum is very attractive to those with military “G.I. Bill” benefits where the military pays for a portion of the training after a certain amount of military (usually enlisted) service. The down side is significantly higher cost and less flexibility. The other issue is that overall flight time accrual is less, which does not help due to the 1500 hour experience requirement if your son wants to be an airline pilot. Recommend you shop around and compare many options. You should also research Part 61 “A-la-carte” schools plus a college degree in something marketable (but separate) from aviation. It does not matter what your son’s degree is to the airlines. It might be good for him to have a degree in something other than aviation in case the industry “tanks” like it did during the last 2008 recession. Hope this helps!