 The NFL does not acknowledge AAFC statistics and records because these achievements – including the Browns' perfect season – did not take place in the NFL or against NFL teams, and not in a league fully absorbed by the NFL.The AAFC proposed match-ups with NFL teams numerous times during its four-year existence, but no inter-league game ever materialized.That made Cleveland's entry into the NFL in the 1950 season the first test of whether its early supremacy could continue into a more established league.