Airstrip (Tiberian Dawn)

Before the Second Tiberium War, Nod did not have actual weapons factories on the battlefield but rather had their units flown in by a large cargo plane from a remote production facility. Once the commander had requested a unit a signal was sent and the plane loaded with the specific unit. When the cargo plane arrived at the Airstrip it dropped off the unit there and returned to its base. Since only transporting one unit at a time was a very inefficient concept, Nod eventually abandonned their Airstrip system and switched to local weapons factories like GDI.