Can I use the default airplanes?
The default flight simulator airplanes are not very realistic. This is especially true for the larger airliners like the default 737-400 of Flight Simulator 2004 or the Airbus A320 of Flight Simulator X. It is fine to use the General Aviation airplanes on VATSIM, since they are simple in the real world as well, but once you are going to fly the big jets, it’s wise to get a professional addon with realistic systems. More about this topic in the video above!