When did nfl start playing
- when did nfl start playing on thursday night
- when did nfl start playing games on christmas day
- when did nfl start playing in germany
- when did nfl start playing in europe
- when did nfl start playing on thanksgiving
- when did nfl start playing internationally
- when did nfl start playing on christmas day
- when did nfl start playing on thursday
- when did nfl start playing on christmas
- when did nfl start playing in london
