Repeating in NFL used to be more common, but Chiefs aim to be first back-to-back champs in 19 years

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 in Las Vegas.

The Chiefs had a chance to do it three years ago, but lost 31-9 to Brady and the Tampa Bay Buccaneers. Two other teams — the 2017 Patriots and the 2014 Seattle Seahawks — also have failed in their repeat bid since the feat was last accomplished.