Societe Anonyme des Etablissements Nieuport amalgamated with the Astra airship company in 1921, but all construction of airships was abandoned and the company name changed again to SA Nieuport-Delage.
This new company's next project was the design and construction of two racing seaplanes for the 1929 Schneider Trophy races, but these were not finished in time to compete. The Nieuport-Delage 62-C1 was a single-seat sesquiplane fighter of partial wood construction, with monocoque fuselage, powered by a Lorraine or Hispano-Suiza engine. The 82-C1 was an all-metal version. Other projects included the N-D 481 single-seat, high-wing aerobatic or sporting monoplane; the N-D 641 mailplane; and the N-D 540 all-metal long-range passenger aircraft, which had jettisonable long-range fuel tanks.