Oracle surged to victory by 44 seconds to retain the Cup they won in 2010.
The Kiwis won four of the first five races, making Oracle modify their boat and call Ainslie from the warm-up crew.
The British sailing legend, 36, a four-time Olympic champion, was drafted in as tactician in place of American veteran John Kostecki and was instrumental in the US outfit's resurgence.
Ainslie combined superbly with Oracle's Australian skipper James Spithill, and strategist Tom Slingsby, another Australian who won Laser gold at London 2012, to drag the syndicate back from the brink in the most remarkable turnaround in the event's 162-year history.
