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→Paper and electronic ticketing
In theory, an e-ticket allows you to just show a valid ID upon check-in, as your name is all the agent needs to access your flight details. However, for security reasons, some airports require you to show a print-out of the itinerary receipt as proof of your booking before entering the airport and/or upon check-in. In addition, when travelling to another country, immigration authorities often require proof of onward or return travel. Moreover, the airline's computer systems are subject to scheduled and unscheduled downtime. In both cases airline ground staff don't have instant access to passenger bookings and will instead have to rely on paper records and hence process passengers manually. So always bring a print-out of the itinerary receipt with you for easy reference.
Due to concerns of credit card fraud, when you purchase e-tickets over the Internet with a credit card, some carriers require you to '''show the credit card''' used to purchase the tickets at the airport or their ticketing office for verification. Take note of this especially if the credit card holder is not part of the travelling party - they need to see the credit card, not the authorised signature of the credit card holder. Failure to do so may lead to re-issue of the ticket with the same (or higher) fare, and refund for the original ticket after many weeks or even months (if refundable; refund fees may apply).
In the extremely rare event that you are issued with a paper ticket, you '''must''' present it when checking in for your flight. Look after your ticket; you cannot check in without it. If you lose the ticket, expect a lot of paperwork and/or hassles: you may be required to buy another ticket for the flight and have to apply for a refund later, or pay a re-ticketing fee. Not to mention that some jurisdictions will require you to file a police report. Hence if you're afraid of losing or forgetting your paper ticket, request for an e-ticket whenever possible. When you lose or misplace a print-out of the itinerary receipt, you can always freely and easily print another copy out from your email or request the carrier/travel agent to email it to you again. The person who gets hold of a lost print-out of an e-ticket itinerary receipt cannot use that as it needs to be complemented by a valid and authentic ID at the airport.