As you have asked about the All India Council of Technical Education (AICTE) approved best colleges offering B.Tech in Aeronautical Engineering, I am giving you information about it, check below for the details

IIT (Indian Institute of Technology), Delhi
Institute of Information Technology & Management’s Aeronautical Engineering Training Academy
School of Aviation Science and Technology, Delhi Flying Club, New Delhi
Engineer’s Training Centre ( E.T.C), Thrissur
Nehru College of engineering and technology, Thrissur
Indian Institute of Space Science and Technology
Jawaharlal College of Engineering and Technology
Group Of Institutions
Holy Matha College of Modern Technology, Ernakulam
Indian Institute of Technology
Mohamed Sathak Engineernig College
Nehru College of Aeronautics & Applied Science
Park College of Engineering and Technology
Hindustan College of Engineering
Madras Institute Of Technology
Karpagam Institute of Technology, Coimbatore
Kumaraguru College of Technology, Coimbatore
Noorul Islam College of Engineering, Kumaracoil
R.V.S. (Ratnavel Subrahmaniam) College of Engineering and Technology, Dindigul
Sathyabama University, Chennai
VSM Aerospace
Hindustan Electronics Academy
Institute of Aeronautical and Marine Engineering
Indian Institute of Science
M.V.J. College of Engineering, Bangalore
Hindustan Academy of Engineering & Applied Sciences
S.E.T. Institute of Technology
Bangalore University of Aeronautical Engineering and Information Technology
Air Force Technical College
Bangalore Group of Institutions
Bearys Institute of Technology
IIT (Indian Institute of Technology), Powai, Mumbai
Indian Institute of Aeronautical Engineering, Dehradun (Uttarakhand)
Institute of Aviation Technology, Haryana (Punjab)
Rajasthan Vidhyapeeth (Deemed)University, Rajasthan
Academy Of Aerospace & Aviation, Indore, (Madhya Pradesh)
IT (Indian Institute of Technology), Kharagpur(West Bengal)
IIT, Kanpur, (Uttar Pradesh)
Indian Institute of Aeronautics, Patna, (Bihar)
National Institute of Aeronautical Engineering, Dehradun (Uttarakhand)
Punjab Engineering College, Chandigarh
IIT Guwahati, Assam
Bihar Institute of Technology, Sindri, Ranchi.
Sanjay Education Society’s College of Engineering Polytechnic, Maharashtra