I've seen a lot of lists of the most planes that go through airports, and passenger numbers, but that's presumably arrive/depart numbers.
What I'm after is what are the airports where the most passengers transit through the airport - ie fly in, don't leave the airport, and take off again, possibly from a different terminal.
As an example, Atlanta is I gather a big transit airport, as is Singapore or Dubai. However, Queenstown, New Zealand for example, people fly in and out of but do not normally transit, so presumably the numbers would be low.
A top 5/10/20 list would be ideal, or else a link to a database that records this information.