Originally Posted by IluvSQ

But the transit desk is usually closed, and you must pass through immigration/customs
to check in again. This can be done without a visa, but you do have to fill in a landing card, and then show your onward ticket. Also beware, you probably have to pick up
your luggage off the belt, and re-check it.

Don't worry, 3 hours is more than enough time to do all.