That's extremely easy to know and understand. What is the men to women ratio for construction work? Heavy equipment operator? Police? Fire fighter?
Conversely, what is the ratio in nursing? Teaching? Childcare?
Despite what some people say, gender is not a social construct and there are very real differences between men and women and their interests.

Women can do anything they want. Most don't choose to fly. Not a single barrier to entry for those that do.