This definition appears somewhat frequently
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Samples in periodicals archive:
© 2015 NFL Enterprises LLC. NFL and the NFL shield design are registered trademarks of the National Football League. The team names, logos and uniform designs are registered trademarks of the teams indicated. All other NFL-related trademarks are trademarks of the National Football League. NFL footage © NFL Productions LLC.
At the corporate level, the National Football League considers itself a trade association made up of and financed by its 32 member teams.  Up until 2015, the league was an unincorporated nonprofit 501(c)(6) association.  Section 501(c)(6) of the Internal Revenue Code provides an exemption from federal income taxation for "Business leagues, chambers of commerce, real-estate boards, boards of trade, or professional football leagues (whether or not administering a pension fund for football players), not organized for profit and no part of the net earnings of which inures to the benefit of any private shareholder or individual.