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Spanair would have been a great codeshare partner for DL and AeroMexico. Codeshares to various Spanair destinations could have been possible from the feed from DL's BCN and MAD flights as well as AM flights to MAD.
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Since Spainair is controlloed by SAS (a Star member), it wouldn't make sense for them to join other alliances than Star.
I agree that SkyTeam need to add some more Asian members. Thai or JAL would be great.
Also the South Pacific would be great, but which airlines are left there?
A partner in South American could be beneficial, so you do more inter continent flights.