The C1s (now C1Ks) combine the shorter fuselage of the Standard VC10 with the wing, tailplane and engines of the Super. A freight door, strengthened floor and roller conveyor loading system were also added. The C1Ks can carry 139 pax or 8 pallets or up to 78 stretchers. The strengthened floor allows vehicles such as Landrovers (and small armoured cars when we had them) to be carried.