Well Jee mains is just an exam and you have to consider different colleges that offer aerospace engineering on the basis of jee mains marks, while most of them are private, they conduct their own entrance exam but can give you a seat on the basis of mains score also.
Some of the top colleges that offer aerospace engineering with the respective minimum ranks and marks you should get in Jee mains ( considering you are a general category student ) to get into them are:
1) SRM University ( private exam SRMJEE, no admission on Jee mains score)

2) IIEST, shibpur ( minimum rank under 13000, marks around 160)

3) MS Ramaiah university, Bangalore ( accepts on the marks of KCET )

4) PEC, Chandigarh ( minimum rank under 17000, marks around 140)
All the best for the future.