air-smoothed

English

(rare) streamlined
- 1960 March, G. Freeman Allen, “Europe's most luxurious express - the "Settebello"”, in Trains Illustrated, page 141:
  The exterior of the train is perfectly air-smoothed and to cut passenger steps up to recessed doors would never do; when the deep doors are shut, therefore, the steps fold up ingeniously on the inside of them to create a level floor in the corridor of the coach.