Boeing 720-023B N7538A
Early in the development stage of the 707, Boeing
recognized the need for a slightly smaller,
medium range variant of the basic design. Initially this was
dubbed the Boeing 707-020, and
differed externally from the original model in that it had a modified
wing profile with increased
sweepback and changes to the trailing edge at the wing roots.
However, in terms of structure
weight the design was, in fact, an entirely new aircraft, resulting in
the designation of the
model 720 being
assigned. American ordered some 25 of them The
photograph of N7538A
above (acquired from American Airlines in the early 1960s) shows the
aircraft with the '707'
on the rear fuselage (tough to see in this reduced image).
It wasn't until 1962 that they
were universally referred to as 720s. This particular machine
went to Middle East Airlines in
1971 as OD-AFQ