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There are various reasons why you cannot check in online on certain occasions. The most common is the need to verify international documentation (i.e. visas), although nowadays some destinations permit you to associate an electronic visa number with the PNR and then check in online.Can I check in online for American Airlines?
On American Airlines, you can check in for your flight online up to 24 hours before the flight using American's Online Flight Check-In. If you're connecting with a flight that American has e-ticketing agreements with, you'll also be able to check in for the connecting flight as well.How does early check in American Airlines?
The early check-in process allows you to print your boarding passes online so you aren't required to stand in long lines at the airport. If you're checking bags, you can enter the number of bags online and prepay if you choose.Why do Airlines ask you to check in on-line?
The airlines love online check-in because they save money on paper costs and personnel. Meanwhile, one of the main benefits of online check-in for travelers is bypassing lines and hassle at the airport.