Hello Raman,
The career prospects after M. Tech Aerospace Engineering are very nice as it is an ever increasing field of work. The major sectors for employment are the Civil Aviation Sector, various government departments, and research organizations like Vikram Sarabhai Space Centre and ISRO (Indian Space Research Organisation). These organizations hire these engineers for the posts of junior engineers. The Hindustan Aeronautics Limited and National Aeronautics Laboratory also hire aerospace engineers as Indian Air Force also does.
Companies in IIT'S are:
Hindustan Aeronautics Limited

Jet Airways

Spice Jet

TATA

Indigo

Aeronautical Development Agency

Safran Engineering Services

Quest

Honeywell

Cambata Aviation
Salary trend after graduating from IIT'S:

Salary trend of Aerospace engineer depends on job profile and employment sector or company for which you are working.

The average salary for a Design Engineer varies from 2.5 lacs to 8.4 lacs depending on the work experience while a Senior Design Engineer earns around 4.9 to 8.9 lacs per annum.The second best paying job in the aerospace and aviation industry is that of a Project Lead, the person earns around 9.0 to 12 lacs per annum, reaching this pay scale after 6-9 years of work experience.

Good luck

Hello aspirant,.
I am here for helping you...
After doing M.Tech from IIT you definitely can take a good job of very good package.
if talking about salary package so it depends upon your skills how much deep you can think and how much skills you have..
Sometimes a topper student fails to get highest package whereas a student who never scored very good marks get success to grasp very high package due to his store of knowledge.
So for having a very good package you will have to  start from your very first day to work on your skills never study for marks, study for your own gratification.

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For more queries you can  upvote my answer and can ask in the comment section below...

Best of luck...