Dornier, I don't know if you've gotten yourself an AI package yet, but wanted to share my recommendation for Ultimate Traffic Live. It does not really come with any cargo carrier schedules and aircraft, including UPS, but they can pretty easily be installed. This past weekend I installed UPS, FedEx, Cargolux, DHL, and a few others.
One thing I realized though is that you do not need to purchase an AI package at all. There are plenty of free AI aircraft and flightplans out there that you can download and install right into FSX/P3D as traffic bgl files. This option requires a fair amount of work on your part though -- finding and downloading airline schedules, aircraft, repaints, etc., installing them all and converting the schedules, then testing to make sure it all works. Very time consuming process, especially at the beginning when you're still hunting down aircraft. With something like UTL or MyTraffic, you just install one piece of software and it's ready to go.
These screenshots below were taken during the day, so the ramps are populated. Keep in mind that these are not static aircraft, but AI aircraft on a schedule. KSDF gets pretty busy with these flights in the middle of the night.


