Hello Ritwik, 

The Airport Authority of India(AAI)  will release the application form for AAI recruitment through GATE from the first week of April. The application procedure is expected to continue till the last week of May. Hence the graduates in Civil, Electrical, or Electronics engineering and Architecture are eligible to apply for the recruitment. The candidates will be shortlisted and selected based on their gate scores and the selected candidate has to report for the document verification and final selection. 

I hope this answer helps you. Good Luck.