Originally Posted by
SanDiego1K
Begin educating yourself about the BA Avios program. It's tricky, as it is decidedly different from other airline programs, but it does have some sweet spots. Wait for a promo and move some of your AMEX points to BA. Right now, you'll only get .8 Avios for 1 AMEX point, thus my caution to wait for a promo. You can then use Avios for AA and AS flights. Avios are charged per segment and per distance flown.
+1.
If the OP can find MileSAAver award space for LAX-SEA on AA or AS
nonstops at aa.com, those flights should be bookable at ba.com for just 7,500 BA Avios each way.
But it's always a good idea to compare cash fares on the route before redeeming miles for an award flight.