De Havilland had wanted Boeing to license-build the D.H.121, while Boeing felt that the aircraft needed to be designed for the American market, with six-abreast seating and the ability to use runways as short as 4,500 feet (1,400 m).
De Haviland quería que Boeing construíse baixo licenza o D.H.121, mentres que Boeing sentía que o deseño necesitaba ser adaptado para o mercado estadounidense, con seis asentos por fila e a capacidade de usar pistas de menos de 4500 pés.