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Your site could also compete with their 'Early Bird Checkin' service that that they charge for:

http://www.southwest.com/flight/early-bird-retrieve-reservat...

I think that those are taken out even before they release the check ins to the public.

Correct. Early bird and A-List automatic checkins occur 36 hours prior to the departure of the flight. The general boarding checkin starts 24 hours prior.

Awesome, thanks for the info - just curious how did you find this out?

http://www.southwest.com/html/customer-service/faqs.html?top...

Southwest Airlines automatically reserves a boarding pass for A-List Members beginning 36 hours prior to scheduled departure of the Member's confirmed Southwest Airlines flight.

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