Why in God's name would Air Scandic even think about using L-1011s?
The thing runs out of fuel after 5½ hours with a full payload whereas the DC-10-30 can always do London to Los Angeles with a full load (and even manage a reduced thrust take-off).
Nobody in their right mind would use L-1011s unless their only concern is to have a very comfortable crew transport and have no interest in economics.