I don't think it is any more difficult for woman to get jobs in aeronautics than it is for men. It's based on the current job market, which currently aerospace engineers are in demand. It also depends on your background and whether or not you are a good fit for the job. They will look at your grades, coursework, internship/work experience, any clubs you're involved in and any leadership skills you might have.
Some tips as you move into studying in the field - Look for internship opportunities early. Get to know your professors. Don't be afraid to ask them questions and if you show interest in topics it may open up opportunities for research. Get involved on campus, companies like well rounded individuals. Find study buddies and support networks. SWE is a great resource in college for finding other women in engineering as well as for finding scholarships and internships.
I wish you the best of luck as you move forward into engineering. :)