Right now it really doesn't matter, every airfield has very long runways, with no wind it does matter what the loaded aircraft weight is. If in the furture , the small airfields had small runways , that limited the ability of an aircraft to carry a full load , that actually had an effect on the ability of pilot to clear the trees at the end of the runway. That might add something to the game play. Large fields having very long runways. Medium fields have shorter runways and Small fields having the shortest runways.