The Dassault Étendard VI was a French prototype fighter aircraft initially developed as part of the NATO NBMR-1 competition to find a standard fighter to serve amongst member air forces.
Dassault took advantage of the fact that the French Air Force had issued a requirement around the same time for a new fighter-bomber and developed aircraft in parallel as variations of the same design concept for the two prospective customers.
It fared well in test flights, but was out-performed by the Aeritalia G.91 that was eventually selected as the winner of the competition.
Data from [citation needed]General characteristics Performance Armament
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