Bob Isom (current president) is the heir apparent. He's punched his ticket in a bunch of relevant operational and finance areas. He's got zero experience on the revenue side, which is probably a big mistake. That's where Kirby was king, and still is.
Nah, I think it's clear AAL's board is nose blind to Parker's faults. Kirby has already stuck it to Parker on multiple occasions -- he's being named CEO shortly, and UAL's financial performance has been kicking AAL's for at least the past three years. They've been getting profit sharing and performance payouts like never seen before (not to the same level as DL, but UAL has always paid better than DAL or AAL and offered less upside on incentive compensation).