NFL clubs may no longer serve alcohol at team functions or on buses or flights, extending a ban that until now applied only in locker rooms. NFL owners and executives were told by commissioner Roger Goodell on Thursday that the rule pertains not only to players but to owners, coaches and guests. "I believe that no constructive purpose is served by clubs continuing to make alcoholic beverages available, and that doing so imposes significant and unnecessary risks to the league, its players and others," Goodell wrote to all 32 teams in a letter obtained by The Associated Press.