Originally Posted by
simpleSnow
What does OLCI stand for?
On Line Check In.
I think the issue is that you buy a ticket with a given passport. So a ticket is tied to a particular passport. Then you do online check-in. Since a ticket can't be tied to more than 1 passport, I'm not sure how it works. Can you check in for a flight with a different passport than the one used to buy it? I feel like that will create an issue with the system. A flight agent needs to then manually waive the ESTA or ETIAS requirement depending on which passport you used initially. Unless, they have changed the system lately.
Different airlines use different OLCI programs. We may be having airline specific threads once ETIAS begins. But this hasn't been an issue with ESTA. The only issue with ESTA as I recall is that the Euro airlines had all sorts of big warning messages about getting your ESTA that they sent even to people who had US passports attached to their reservations. But that never stopped OLCI.