For some reason, the US government is more strict with the security measures for the people entering the US from another country.
Today, MIA waked up with some bad news for the airlines and pax.
All of the ITI pax (International to International) passengers have to go trough US customs, and claim their luggage and then go by the customs X-Rays and then to take the bags to the airline.
Lets give an example.
Passengers arriving from Madrid on IB that continue their flight to Cancun (since IB does not have a direct flight it stops in MIA to change a/c), these pax go trough immigration (that's normal) then claim their luggage, go trough customs, then taking it to the airline, then to go back trough the security checkpoints (caos) and then to the gate, when that type of operation was made in a half an hour by only passing trough immigration then to the In-transit lounge.
This means delays, not only with IB, but to all of the international carriers.
When you as a pax check in at any international airport for example (LHR) your final destination is LPB (with a stop in the US), in the ticket counter in London Heathrow your luggage is check all the way to La Paz, so you don't have to pick up your luggage and check it in at the airline your are flying to continue to your final destination.
Since we live in a free country, I don't believe that this is a good system.
This is going to hurt more the tourism in the US, and the airlines that are struggling from the downfall of 9-11.