CREATE TABLE table_43638 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" TEXT)

What is the Attendance of the game September 21, 2003?
SELECT "Attendance" FROM table_43638 WHERE "Date" = 'september 21, 2003'
SELECT "Attendance" FROM "table_43638" WHERE "Date" = 'september 21, 2003'