San Diego led the Western Division for the entire season, with the Oakland Raiders following one game behind from Week Eight onward.
Starting from a 2–4 handicap was insurmountable, and although Oakland beat San Diego twice (34–33 on October 27, and 41–27 on December 8), they were unable to catch up.
The Eastern race changed in Week Seven, after the Jets lost to Oakland, 49–26, and the Patriots and Houston Oilers tied at 4–3–0 for the lead.
Buffalo won 19–10 over the Jets, while Boston lost 35–3 at Kansas City, giving the Bills and Pats records of 7–6–1 and forcing a one-game playoff, for a spot in the AFL Championship game.
However, the Western Division race had not yet been decided and Chargers and Raiders owners Barron Hilton and Al Davis respectively objected to playing the Eastern playoff "early" on the grounds that it would have given the Eastern winner an unfair advantage in terms of rest in case the Chargers and Raiders also had to play a tiebreaker.