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And the difference between those cockpits and the EX-TWA MD 80's ?The codeshare is almost 20 years old, and technically, the partnership with Alaska goes back even further, to 1982. Braniff had an interchange with Alaska Airlines that AA took it over after BN1 imploded. AA metal would operate DCA-ORD-SEA-ANC-FAI RT (391/392), and AS metal would operate FAI-ANC-SEA-DFW-IAH RT (393/394), keeping the same flight number on both airlines, and a crew change at SEA (AS worked west of SEA, AA worked east of SEA).
That worked as long as both AS and AA were flying former BN 727-227 aircraft with the same cockpits, systems and engines. When AS retired their 727s in the early 90's, there were enough differences between AS's MD80s and AA's that a crew change wouldn't work anymore. That's when the codeshare came into being, and it slowly moved beyond just those routes into other ex-SEA routes where AA didn't operate.