Found a flight on American that I was interested in (Philly to Portland, stopover at LAX--I'd get off in LA.) Great deal on the flight, now...how to book? Can go directly through Amex's travel portal, but don't get more than a 1% return on my points. Was thinking about a transfer to Avios. Here's my question--the flight won't show up on BA's site the way that other American flights do. Keep getting an error message that BA doesn't fly that route, at least not that time of year. Can anyone help me on this?