I wouldn't disagree with any of the existing recommendations - I've enjoyed and read most of them.
I'll mention however - one of my roles in life is supervising PhD students in aviation subjects. Often they are not people whose first language is English, and always they are not yet used to the sort of high quality writing required of a doctoral candidate.
I've had really good results setting Neville Shute as compulsory reading - accessible, but also an excellent example of really clear writing about aviation topics, by an extremely competent and literate aviation professional. For the purposes of the original poster, it doesn't get much better.
G