According to that one site: The Y-4 Military Transport was first introduced to the Galactic Empire shortly before the treacherous Incom Corporation was seized by order of the Emperor. The traitors at Incom designed the craft to be a military grade troop transport. And as a result they designed the transport to move hard and hit quickly. While the transport features good performance qualities and is a sturdy design, it was not widely accepted in the Imperial Navy due to it being an Incom product. Not surprisingly the Rebels also make use of the Y-4 Transport. A civilian model of the Y-4 also exists. Although the civilian model lacks weaponry and armour plating, they are usually forced to arm themselves against pirates and other hazards plying the space lanes. While they feature less powerful engines than the military model, they are reliable for courier duty. Its main mission is to ferry troops and supplies between starships. Troops and vehicles can disembark in seconds from the transport due to its flank folding assault ramps. This three engine transport features swing wing S-Foil capability for emergency braking and increased manoeuvrability. A one metre thick heat shield and extra layers of spray-on ablative coating serve to increase the Y-4's heat resistance. The retractable swing wings are located along either side of the craft, just below its dorsal surface and just above its ramps. This allows the Y-4 to land on a planet quickly and quietly. And on top of that the Y-4 possesses a modest weapons platform for infantry support purposes. Located above its forward weapons is the bridge, from which the pilot, chief gunnery officer and the astromech droid sit (the second gunnery officer sits in the turret). And located on its dorsal section, right behind the bridge is its swing wing S-Foil driver. Y-4Transportb.jpg P.S. Does anyone like my signature? yes your signature is amusing.