There are only two colleges in Delhi which offers the course of BTech in Aeronautical Engineering course and the name of the colleges are-

National Institute of Aeronautical Engineering Research and Management, New Delhi

R and R Education Foundation, Delhi

You can check the BTech in Aeronautical Engineering colleges in India, consider the link provided below:

https://engineering.careers360.com/colleges/list-of-be-btech-in-aeronautical-engineering-colleges-in-india

For more information regarding Aeronautical Engineering as a career, consider the link provided below:

https://www.careers360.com/courses/b-tech-in-aeronautical-engineering

I hope this helps. Wish you a great day!