Nieuport-Delage NiD 640

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NiD 640
Role	four-seat cabin monoplane Type of aircraft
National origin	France
Manufacturer	Nieuport-Delage
First flight	1927
Introduction	1930
Primary user	Société des Transports Aériens Rapides
Number built	14

The Nieuport-Delage NiD 640 was a four-passenger transport monoplane designed and produced by the French aircraft manufacturer Nieuport-Delage.

It was developed during the late 1920s primarily for use a civil aircraft, although some provisions were made towards its use in a military capacity as well. The NiD 640 was designed with a highly-efficient elliptical wing, a readily swappable engine arrangement, and made copious use of metal throughout its construction. It was outfitted with dual flying controls and other provisions that enabled the effective tuition of up to four trainees during a single flight. The baggage hold could also be adapted to accommodate wounded personnel when used in the air ambulance role.

First flown in 1927 and introduced during 1930, the sole NiD 640 was soon joined by a batch of twelve NiD 641 production standard aircraft, the majority of which were operated on the civil routes of Société des Transports Aériens Rapides. Further production batches did not occur, save for a single NiD 642 that went unsold and was ultimately scrapped.