Hepburn was 2 yrs younger than Hughes at only 28 in 1935 when she’s first introduced in the film. Blanchett looks 40 (was 35 at the time). Her attempt at replicating Hepburn’s unusual voice needed a lot more work, her appearance hardly favored Hepburn. I greatly disliked her in any scene.

https://www.amazon.com/Aviator-Leonardo-DiCaprio/dp/B001N09BDS