A FlyerTalk Posting Legend
Join Date: Jul 2002
Location: MCI
Programs: AA Gold 1MM, AS MVP, UA Silver, WN A-List, Marriott LT Titanium, HH Diamond
Posts: 53,010
A year ago, I would have said "No way - AA.com is always cheapest."
In the past year, AA.com has been the cheapest for about 80% of my flights; Orbitz has beat it about 20% of the time. Sometimes Orbitz beats it with a 30-40% lower fare, other times it just beats it by a few bucks more than the commission and bonus mile value.
I have never seen Expedia or Travelocity beat AA.com - just Orbitz - but I always run a quick check at those sites just in case.