I found this on John Chuckman's Chicago Nostalgia and Memorabilia site. Roosevelt High School had an AT-6 after the war for the Aero Shop class:

The only yearbook photo I could find was from the class of 1948; note it still had its wings:

All I can see of the serial is 41-159?? - the L244 code means it came from Minter Field. Anyone know more? The school also had a Link Trainer.
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All right, Mister Dorfmann, start pullin'!
Pilot: "Flap switch works hard in down position."
Mechanic: "Flap switch checked OK. Pilot needs more P.T." - Flight report, TB-17G 42-102875 (Hobbs AAF)