 It was a full-season Class A league from 1963 through 1966, and became a short-season Class A league in 1967.At least half the leagues teams (Auburn, Batavia, Connecticut, Lowell, Staten Island, Vermont and Williamsport) would be shuttered when the current MLB/MiLB agreement ends at the end of the 2020 season, under a proposed plan calling for the Short Season Class A designation to be eliminated.The start of the 2020 season was postponed due to the COVID-19 pandemic before ultimately being cancelled on June 30.