I've got a 20% off coupon expiring on Expedia tonight and need to book a flight to NY from SF for late September. There's a RT on Expedia for $285 which presumably will come down to $228 with the 20% off coupon - I can also buy the exact same RT on AA.com for $255. Do you think it's worth it to save $27 to forego the extra 1000 miles I'd get by purchasing the ticket on AA.com?

Thanks!