CREATE TABLE table_24471 ("Team" TEXT, "Sport" TEXT, "League" TEXT, "Established" FLOAT, "Began in St. Louis" FLOAT, "Venue" TEXT, "Championships in St. Louis" TEXT, "Left St. Louis" FLOAT)

How many championships were won for arena football?
SELECT "Championships in St. Louis" FROM table_24471 WHERE "Sport" = 'Arena Football'
SELECT "Championships in St. Louis" FROM "table_24471" WHERE "Sport" = 'Arena Football'