I have a French passport and a US passport. If I book a flight with United Airlines with one passport and the airline employee at the check-in desk refuses it due to its physical condition, can I check in with the second passport? Assume I don’t have to present any visa to the destination country’s immigration officers that can’t be done on arrival to be allowed to enter the country.
FYI I’ve asked a similar but more general question recently If I book a flight with a passport and the airline employee at the check-in desk refuses it, can I check in with a second passport of mine? but it got closed and according to Should questions whose answer may depend on the airline or the check-in airline clerk be closed as “opinion-based” or be left open? (mirror) that’s because the answer depends on the airline.