Originally Posted by
18sas
To my knowledge, Shannon Airport is the only European departure point that has US pre-clearance,
Well, that's it. I've been flying or connecting through Dublin usually. (There have been USA formalities there also for years and years.) If it'd been some other place it Europe or Asia, it may have been different.
Boy, I'd sure rather get relocated by the CBP to Mexico City or Acapulco or Cancun or Puerto Vallarta or Guadalajara than Winnipeg or Calgary or Newfoundland. Maybe that's just me. And the margaritas on the beach. And the sunshine and the music and ... and ...