Is there some particular job you may be interested in? Your query is pretty broad and there are so many kinds of jobs in an airport - administration, HR, aircraft maintenance, pilot etc. For aircraft maintenance engineering, you must do the engineering course from an authorised institute, appear for an exam that will be conducted by DGCA before you can apply for a job. Check the list of institutes here

HAL, AAI are some PSUs that recruit engineers so you need to check their career sections as the degree depends upon job profile.

I suggest you check the AAI website, career sections before deciding what you may like. Any job wont do so you should do a little research before deciding. Write to us what you may have decided and we could then give you better information