Masters

You can do IATA course with some IATA learning Centre. It is a part-time course. It is just for 6 months.

Royal College, London is the best. You won't be able to get admission there. Try for university of Edinburgh. PG abroad is not valid in India and in UK entrance exam MRCP is there, plus you also need to score 7 plus in IELTS.

B.Sc graduates have a wide variety of options available in terms of topics, subjects, & field . They have an option to pursue a post graduation degree in their respective field. Students can also join non-science master degree courses such as animation, management, journalism, computer technology, etc after the completion of B.Sc degree.

Yes, you can apply for NET exam after doing your Masters.

You do not have a special M.Tech for airline Ground duty. On the other hand, MS or M.Tech will make you a maintenance or system engineer (to work on aircraft), but will not enable you to fly an aircraft. Anyone can do Mass communication (even without Engineering degree), as long as you have creativity and good marketing & communication skills.

Yes, you are eligible to get admission for B.Ed, as you have 52% marks in PG. Minimum 50% marks either in graduation or Masters is sufficient. You belong to OBC category, so you will get some relaxation in your percentage.