Hello tarun 

Aerospace engineering focuses in designing, construction, development, testing,and maintenance of commercial and military aircrafts and spacecrafts. 

Major job opportunities for aerospace engineer are available in Air Force, Airlines, corporate research companies, helicopter companies, defense ministry, NASA and many more. 

If you get into these sectors you can earn up to 6-15 Lakhs per year. 

Salary depends upon your experience, the more you gain experience more you get paid. 

Hope it helps :)

All the best :)