The Special Freighter program converts passenger 747-400s to cargo carriers. For the conversion, a 747-400 passenger airplane receives a side cargo door, a strengthened main-cabin floor, a full main-deck lining and provisions for a new cargo handling system with an upgraded flight deck. The 747-400 Special Freighter has positions for 30 cargo pallets on the main deck -- comparable volume to that of a new 747-400 Freighter. It is also capable of seating up to 19 people, an option found on no other converted freighter.