(AP) — Repeat championships in the NFL used to be more common.
Over the first 39 Super Bowls, it happened eight times. But no team has done it since Tom Brady and the New England Patriots won two in a row following the 2003-04 seasons.
Patrick Mahomes and the Kansas City Chiefs are aiming to become the first back-to-back Super Bowl champs in 19 years when they face the San Francisco 49ers on Feb. 11…
