Great question — answering as the UphillTech team:
It is quite easy to look up information about a reservation if you have the PNR (a.k.a. record locator, booking reference, confirmation code, reservation number, etc.) or ticket number plus the name of the passenger. Most major airlines provide an online form where you can do this, e.g. ANA , Icelandair , Air Canada . The only catch is that you must use a locator which the airline's system understands, which you may not be in possession of if you booked, for example, through a partner airline. Depending on where the ticket was booked, it may also be possible to look up the information from a GDS or travel agent website. Expedia lets you look up an itinerary with the itinerary number and the...
Full answer by choster: https://travel.stackexchange.com/a/147061 (CC BY-SA 4.0).
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