At the end of each season, an Alliance champion was determined in the Triple-A Classic, a best-of-seven postseason series.
[8] The Indianapolis Indians repeated as Alliance champions, defeating the IL's Richmond Braves, 4–0, in the 1989 Triple-A Classic.
[10] At the 1990 Triple-A Classic, the AA's Omaha Royals defeated the IL's Rochester Red Wings, 4–1.
[15] On July 9, 1991, at the Triple-A All-Star Game, International League team owners voted, 5–3, to discontinue interleague play with the American Association after the season.
[17] The combination of poor attendance, travel costs, and difficulty in drawing up season schedules were all factors in their decision to end the partnership.
[17] The final Triple-A Classic was won by the AA's Denver Zephyrs, 4–1, versus the Columbus Clippers.
Over the all-time interleague series, American Association teams won 637 games, 19 more than the International League's 618 wins.