Soon afterwards, Nieuport-Delage built two examples of a modified version for the 1924 Coupe Beaumont as the NiD 42S,[3][4] on which the main wings were mounted directly to the sides of the upper fuselage at shoulder position with a short subsidiary wing fitted around the undercarriage axle.

[2] One of the latter was exhibited at that year's Salon de l'Aéronautique, along with a NiD 42 C.1 nose section to illustrate an alternative engine mount.

[9] These differed from the original NiD 42 fighter in having a second, small wing added to the lower fuselage, turning the parasol monoplane into a sesquiplane, a design feature adopted from the NiD 37[10] which would be a key identifying feature through most of the versions developed from the 42.

Only two examples of the two-seater were built,[1] but Nieuport-Delage entered the single-seater in the 1925 concours des monoplaces, a competition by the Army's Technical Service to find a replacement for the NiD 29.

[10] The NiD 42 was selected from a field of eleven competitors, and an order for 50 aircraft was placed,[10] of which 25 were eventually delivered.