Can I have food in flight? Like if I am traveling in Air India, can I have a chicken meal if the air person says it's halaal or I should have only Veg meal or I shouldn't have food only in flights. Not being aware of where and who has cooked it after residing in India (majority non Muslim country).

If the person told you is Muslim, and it built a type of probability that the meat or chicken are halal, then you can.