I will second PBFT. Very nice folks. Typical old aircraft. Good instructors. Doing my commercial there. There are actually at least four flight schools at Lantana. Not to mention independent instructors. I did my instrument there last year with an independent instructor. If you want to fly in newer airplanes at a bit higher price per hour, one of the schools trains in very nice Diamond aircraft.
Check out Palm Beach Flight Training, they have various type of training. From private all the way to ATP. Great school, well maintained airplanes. Ask for Michelle!
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