UNITED Parcel Service (UPS) has ordered 10 more Boeing 757 freighters to meet growing demand for its parcel delivery service. Five will be delivered next year and five in 1995. The planes, valued at more than US$600 million with spares, will be powered by Rolls-Royce RB211-535E4 engines. UPS has ordered 65 B757s since 1985, 35 of which are already in service. The company has options on another 36 B757s. In January, UPS ordered 30 B767 freighters, which feature a flight deck almost identical to that of the B757. The two also share many aircraft systems as a result of which UPS will enjoy significant savings in crew, training and maintenance costs. Meanwhile, the advanced-technology Boeing 747-400 freighter, which can carry more cargo further than any other commercial aircraft, has received certification for commercial operation from the US Federal Aviation Administration. The big cargo jet can carry 122 tons of payload more than 7,400 kilometres.