Originally Posted by
JerryFF
If one is flying from London to Jamaica with a connection in Miami, is it necessary to clear customs and immigration in Miami before boarding one's connecting flight? Thanks.
Yes. The US doesn't have transit zones in airports. No matter what you have to clear US immigration at the first point of entry into the US.
Now, MIA does offer ITI, so it is possible that when you check in at LHR, your bags might be tagged ITI, which means they are transferred for you without you needing to retrieve them at MIA. But you will still have to go through immigration and back through security at MIA.