sentences:  It was intended to replace the 707s operating the all-passenger services with a brand-new, larger capacity as well as more fuel-efficient DC-10 widebodied aircraft at the start of the 1978/79 winter timetable period.Following an exhaustive, three-week evaluation of the Boeing 747, the McDonnell Douglas DC-10 and the Lockheed L-1011 Tristar during the early summer of 1976, BCal chose the DC-10 as the wide-bodied aircraft best suited to serve its expanding long-haul route network.The immediate availability of the aircraft was important so there was no British-engine option, the 747 too large and the Tristar could not be delivered in time.