Aeronautical Engineering

Job opportunities-
Maintenance of Aircraft - aerospace engineers test new aerodynamic and aviation systems, and maintain them. Aircraft designer - aerospace engineers specializing in this field deal with designing, constructing, and testing aircraft, missiles, and space crafts. They may conduct basic and applied research to evaluate adaptability of materials and equipment to aircraft design and manufacture. Aviation Engineer- aerospace engineers in this field deal with the airport design, aircraft navigation technologies, and aerodrome planning. Defense - aeronautical engineers in this field deal with creation, maintenance and deployment of defence aircraft such as fighter jets, choppers, bombers, etc. Also, the job requires being able to handle such aircraft at necessary times. Where all can I work? As everyone here mentioned right, you can work in the government sector with ISRO, DRDO, HAL, etc. And then we can look at private companies such as L & T, Godrej & Boyce Aerospace, Boeing, Airbus, Mahindra, etc. You can also go for Indian Airforce and Indian Navy.

Aerospace engineering is the primary branch of engineering concerned with the design, construction and Science of aircraft and spacecraft. It is divided into two major and overlapping branches: aeronautical engineering and astronautical engineering. The former deals with aircraft that stay within the Earth's atmosphere, and the latter deals with craft that operate outside it. While aeronautical engineering was the original term, the broader "aerospace" has superseded it in usage, as flight technology advanced to include craft operating in outer space. Aerospace Engineering, particularly the Astronautics branch, is referred to colloquially as "rocket Science". An Aeronautical Engineering degree would be useful if you wish to have a career related to aircraft, helicopters and related fields. However, aerospace engineer besides working on aircraft and helicopters, can also work on rockets, missiles, space station, space-shuttle, lunar or interplanetary probes and more.
Thanks.

Yes, you are eligible to pursue aeronautical engineering course after the completion of your mechanical engineering Diploma course. Candidates who have completed 12th standard with non-medical science stream or those who have completed three years Diploma course in Mechanical/Aeronautical Engineering are eligible to pursue aeronautical engineering course. To get admission in aeronautical engineering course after the completion of your three years Diploma course, you need to appear and qualify lateral entry examinations like LEET/ECET/JELET, etc. By qualifying the entrance examination based upon your examination rank, you will be allotted a seat in a particular college and you can get admission in the second year of four year B.Tech course. But I would suggest you continue with mechanical engineering because it has a huge scope in near future and you can also go in the aeronautical field after that.
Best of luck.