Mixed feelings on this one.... It's about $50M in revenue according to what WNP posted. There are probably 300-500 clerks/CC's/agents/CSM's systemwide that work nothing but domestic mail. Assuming $65K per year salary and benefits, at the high end, that's between $20M and $32.5M just for salary and benefits that are directly tied to handling the mail. That doesn't include all the overhead and infrastructure expense, such as scanners, tractors, carts, or the fuel required for both the tractors as well as the incremental weight on the aircraft.
In addition to the expenses, I'm sure there's other money being left on the table because since mail displaces PPS and other revenue freight.
Bottom line -- not a huge profit margin. The scanning requirements by USPS just add expense without any added revenue, so perhaps the time has come for AA to do what Northwest did last year -- stop dealing with the headaches surrounding domestic mail.
The conspiracy theorist in me says that taking mail away from the legacy carriers was the USPS's intent from the day they launched their partnership with Fedex. The scanning standards were set so high that only Fedex and UPS could meet them, since they already used scanning for tracking their packages.
But that's just a theory....