he Convair 990 Coronado was an enhanced version of the Convair 880. Specifically, it was 10 feet longer, could hold as many as 39 more passengers, and has anti-shock bodies extending back from the ... trailing edge of the wing (see picture below).
General Dynamics, the parent company of Convair, was the third American aerospace company to enter the jet race behind Boeing with its 707 and Douglas with its DC-9. Being third was a distinct disadvantage as most airlines had already purchased jets before the first Convair ever flew. However, Convair believed it could win with a jet that would be the fastest civilian aircraft in the skies.
[Text and Photo provided by: http://www.super70s.com/Super70s/Tech/Aviation/Aircraft/Convair-990... ]