The SNCASO SO.9000 Trident was a French mixed-power interceptor aircraft developed and constructed by aircraft manufacturer SNCASO. While it achieved promising results during testing, including the establishment of several world records during flight tests, the French Government chose to cancel its order for the Trident, leaving it as a development programme only.
The Siemens-Schuckert D.IV was a late-World War I fighter aircraft from Siemens-Schuckert (SSW). It reached service too late and was produced in too few numbers to have any effect on the war effort.
