Absolutely nothing 'Art Deco' about it, Deco was all about straightlines and applied decoration.
Wrong. Think Art Deco of the 30's, when this aircraft was made, and you'll find it fits the style perfectly.
Wrong, you're conflating
Streamline design styling of the '30s with Art Deco which was of the 1920s.
Anyhow, Streamline as a style is not applicable to aircraft as it was a design motif inspired by the aviation
industry engineering and aerodynamics, aircraft were not, and are not, styled in the of automotive styling.