Redshirt freshman Christian Chapman threw for 203 yards and one touchdown in his first start for the Aztecs (10-3), who won their ninth straight game. SDSU could be headed for the Hawaii Bowl on Christmas Eve in Honolulu.

This is their first outright title since winning the Western Athletic Conference crown in 1986. They shared the 2012 MWC championship with Boise State and Fresno State.

SDSU took a 24-17 lead after touchdown runs of 1 yard by fullback Dakota Gordon and 28 yards by Rashaad Penny.

Air Force (8-5) tied it on Timothy McVey’s third touchdown, a 2-yard run on fourth down with 11:49 to go.