Hello Tarang,Aeronautics or Aerospace Engineering are the primary field of engineering concerned with the development of Aircraft and spacecraft.
If your JEE Main percentile is around 88 percentile then rank after JEE Main April will be around 1.2 to 1.4 lakh.you should know first that the NIT's don't offers Aeronautics engineering.
I am giving the list of some IIT's and closing last year rank for general candidates

IIT Madras - 3612

IIT Bombay-2082

IIT Kharagpur-3822

IIT Kanpur-3497

For getting Aeronautics in IIT's you have to clear JEE Advanced with a decent rank.More over some private college such as SRM University Chennai, Amity University Mumbai, LPU Chandigarh etc. you can also try there.

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