Sometimes when I am taxing to the gate and select the GSX menu it lets me choose a service company like Swissport or Servisair, but when I am parked at the gate and enable GSX, I only can choose airlines, usually the airlines in the afcad parking code. This is a change from previous GSX versions. At American airports it would be great to have the option of all the service companies since many like Menzies are the ground handling provider. For example for Virgin America it is Menzies at most airports.