I think so, for financial reasons. AA cut themselves out to cut costs. Orbitz and other similar services were (from what I heard) overcharging AA for referral

I think so, for financial reasons. AA cut themselves out to cut costs. Orbitz and other similar services were (from what I heard) overcharging AA for referral costs. Naturally, I think Hipmunk and AA simply have a deal that won't really hurt AA.