Originally Posted by
rsqrott
However, this brings up another question. If he uses his existing passport when he books the tickets for travel to Mexico, then uses a second passport when he actually uses the tickets to travel to Mexico won't there be a problem with him having a different passport #? I'm assuming that the 2nd passport will have a different #.
It is not a problem to book with one and check in with another. The airline will want to verify the details and update the flight manifest but otherwise not a problem at all.