Boeing looked at many wing designs and engines for the new tanker.
These two new tankers were slightly larger and faster than their earlier class members.
The Air Force is seeking to receive a total of 179 new tankers.
Just before the oil crisis of 1973, the company placed an order for two new large tankers.
Between 1950 and 1960 Eagle Oil acquired at least 16 new tankers.
It bought numerous new tankers, including six of about 13,000 tons each.
A new tanker to be launched into a high-acceleration rescue trajectory.
If they do that they can coast until the new tanker reaches them.
A new double-hulled tanker of the same name was commissioned in 2008.
Between 1950 and 1960 the company took delivery of at least 16 new tankers.