It is due to the fact you have to enter the "sterile" area again prior to go over to the landside area. It would be nice if MCO had a dedicated International Arrivals terminal, but it doesn't. BTW this is similar to some of the smaller international gateways in the USA. PIT is similar to MCO in that you have to go back into the sterile area to take a tram over to landside terminal after clearing customs, so you get re-screened there as well. CLE also has customs near the end of the "A" pier. After clearing customs, you have to re-screen to get into the sterile area to get to baggage claim, however they often have you board a bus after customs and they drive you around to the landside curb to go claim your bags. It is much nicer when customs empties out into the non-sterile area of the terminal.