FlyerTalk Forums - View Single Post - Unable to check-in online due to document check, how does that impact upgrade chance?
Old Dec 12, 2019 | 5:23 pm
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Repooc17
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Not sure how the UA app or the website can verify the validity of onward travel. I am not aware of any other airline's app or website can do so.

I just traveled on an one-way ticket from Asia back to the US on another airline, and couldn't check-in online, on the app, airport kiosk. Human involvement would still be required with certain scenarios.
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