See, most of the good private colleges which offer the course of Airline and Airport Management require you to score very well in your class XIIth examinations. Once you have a good percentage and along with it have some good extra curriculars, you can get into these colleges easily! Some of the good colleges in India for the said course are:

School of Business, University of Petroleum and Energy Studies, Dehradun

DYPUSM Mumbai - School of Management Dr DY Patil University

HITS Chennai - Hindustan Institute of Technology and Science

Hope I have answered your question. All the best!