Hate to seem like a shameless UA PR machine on the AA board, but...

Since you mention SFO-JFK and LAX-JFK, definitely UA given the new p.s. service, whether you upgrade or not. Economy is all Economy Plus with extra legroom, and business class are leather seats reclining to 150 degrees with similar to international service. First class has lie flat beds that are the same seat as Singapore Airlines' Raffles class seat.