Here are some of the airlines currently offering check-in online and a few of the particulars of their web check-in services -
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Alaska Airlines - Check-in online is available up to 30 hours before the flight.
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America West - Check-in on the web is available the day prior to departure up to 90 minutes before departure.
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American Airlines - Offering 500 bonus miles for the first time that online check-in is used until September 30, 2003. Online check-in is available up to 12 hours prior to departure.
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Continental Airlines - Offering 1000 bonus miles for the first time online check-in is used up to September 30, 2003. Web check-in is available 1 up to 30 hours before departure. Top tier Continental frequent flyer members can also confirm (when available) or standby for Elite upgrades.
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Delta Airlines - Check-in via their website is available from 24 hours to 90 minutes prior to departure. Check-in for flights on Song, Delta's low cost carrier, is also available online.
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Northwest Airlines - Can also retrieve your booking by the credit card number used to purchase the ticket. Check-in is permitted for U.S. domestic as well as international flights on Northwest. Check-in is open online from 30 hours up to 90 minutes before departure. They also have a useful FAQ to answer any other questions you may have about their check-in services.
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United Airlines - Website facilitated check-in is available from 1 to 24 hours prior to departure. Earn up to 1000 bonus miles before December 31, 2003.
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US Airways - Check-in at their website is available from 1 up to 24 hours prior to departure.
And so to sum up this check-in process - save time, don't wait in line, check-in online, and have a better shot at getting the seat you want.