A prop driven B-25, not a B-52. The B-25 is a 2 Engine medium bomber from WW 2, considerable smaller as well as carrying far less fuel then a modern Jet Liner. The fuel in a B-25 would also buring a less volitable fuel. The B-52 1st assigned to combat commands in 1961.
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http://www.fas.org/nuke/guide/usa/bomber/b-52.htm
A total of 744 B-52s were built with the last, a B-52H, delivered in October 1962. Only the H model is still in the Air Force inventory and all are assigned to Air Combat Command. The first of 102 B-52H's was delivered to Strategic Air Command in May 1961. The H model can carry up to 20 air launched cruise missiles. In addition, it can carry the conventional cruise missile which was launched from B-52G models during Desert Storm.