I also personally find it Air, even during 2 station operation, however that still is no where near as slow as when there is one station. The reason Air takes so long to move, is because the trains take a long time to load and get into the dispatch sequence. Also the restraints are controlled by twin locks and a computer, so if one lock hasn't engaged but the ride hosts haven't noticed, either the operator will have to call the seat again, or the ride will pull into the flying position but the computer will not let it dispatch. Then they have to lower the train, check the restraint again and start the sequence again.
Also, despite Air having 3 trains, UK Health and Safety law says that only one train can be in a single block of track at a specific time. On the German Fairs, they count all sets of MCBR's and the lift hill itself as a block where they are able to stop the train if an error occurred, however on Air the only 3 blocks used are the station, main track itself and the brake run. Therefore one train cannot dispatch until the previous one has hit the brakes, thats why you often find yourself waiting in either the station or brake run for another train to finish.
This problem also occurs on Rita, however the queues on Rita are mostly due to low capacity (20 per train). However with Rita, the track is much shorter anyway, and there is no lift which takes up time on another coaster. Plus, unlike Air, Rita is able to dispatch once the previous train is coming into the second set of brakes.
BTW Dara, I don't actually think the queue times signs are done by popularity, I think it's just alphabetic. Air has always been at the top as it is "A", and Battle Galleons took Charlies Place as it comes before it in the alphabet. Still, I think it's a bit weird how they have Squirrel Nutty and Submission on there, i've never seen either with a queue :lol: