After his discharge from the Air Force, Piskor joined the New York Yankees of the All-America Football Conference (AAFC) in 1946. The Yankees finished the year with a 10–3–1 win-loss-tie record and faced the Cleveland Browns in the AAFC championship.[4] The Yankees lost the game 14–9.[4] Piskor, who worked for the Yankees as an accountant in the offseason, was sent to the Buffalo Bills in 1947 and then traded to the Browns for John Duda and Jack Carpenter.[3][5] Cleveland finished the season with a 12–1–1 record and won the AAFC championship, beating the Yankees in the title game for the second year in a row.[6] Piskor was sent to the Chicago Rockets in 1948 as part of a league-led effort to balance out talent among the AAFC's teams.[7] He spent one season with the Rockets before retiring from professional football.[8]