Couzinet 10 Arc-en-Ciel French trimotor long range passenger plane first flown in 1928

The Couzinet 10 Arc-en-Ciel ('Rainbow') was built as a first example of the three-engined, aerodynamically refined, cantilever low wing monoplane designer René Couzinet thought offered the safest long range passenger transport, for example on the South Atlantic route. Only one was completed, though other, similar aircraft of different sizes and powers followed.