How many colors are there on the flags in the world?

The following NFL Teams have red as a team color:

• Arizona Cardinals (Cardinal Red)
• Atlanta Falcons (Black and Red team colors)
• Houston Texans (Deep Blue Steel & Battle Red)
• Kansas City Chiefs (Red)
• New England Patriots (Red Alternate)
• San Francisco 49ers (49ers Gold & 49ers Red)
• Washington Redskins (Burgandy & Gold)