As noted in the memo, a unanimous decision to extend the commissioner's contract was reached in May of this year.
Dallas Cowboys owner Jerry Jones, considered by some the second-most powerful figure in the NFL, pushed back against Goodell's contract process and had some support, but it appears that the league's Compensation Committee had its way.
Goodell will also have access to a private plane of his choosing when he retires, though he will have to pay for air travel, maintenance and crew fees, the sources added.
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Atlanta Falcons owner Arthur Blank, who heads the compensation committee, told The MMQB he was "relieved" that Goodell had signed the deal. Jones at one point threatened to sue his fellow owners over the matter, a stance he later dropped.
Jones supported a performance-based contract for Goodell, rather than the fully-guaranteed pay structure of years past.
Jones had been removed as a non-voting seventh member of the compensation committee after his threat of a lawsuit.
The NFL is the most-watched US sports league, generating about $14 billion in annual revenue. Questions about the likelihood of an extension also followed the debate over NFL player protests during the national anthem earlier this year. The agreement is worth as much as $200 million, though much of the pay is linked to financial targets and other incentives, according to the New York Times.