The quickest simple one is LAX-EWR-LAX on a crappy 757 but it gets you the 180TPs in 2 flights.

There is also LAX-HNL-LAX; more exotic and you might even get on a more comfortable 767-300.

Suspect you already have your BA flights to LAX. Otherwise, if you had the time and were desperate for TPs you could have asked the company just to fly you on the BA LHR-EWR route. You could then do EWR-LAX-HNL-LAX-EWR which would get you to 720TP. But if you are back to BA Blue, your points would reset in the middle of the flights which may get confusing as the AA points are slower to post that the BA ones.