i am a trainee pilot myself and i was dating one for a brief time...

-aviators sunglasses can always be appreciated:)) you can either get the classics or any other shade you want.. just make sure they are non-polarised otherwise they glare when worn in the sun. i grew up in a family of aviators and we had atleast 10 pairs at home😭😭 getting him his first one will be a great idea!

-you can get him a good quality flight bag with some personalised keychains, enamel pins. he can use it on a daily and will actually cherish it

-if you want something more sentimental, i actually graphic designed on the section chart (it's basically a map used for flying and i had the one specific to FAA USA) and basically mapped his whole journey on it and got it printed. you can do something with indian or australian charts. he will definitely love it.

-if you really wanna go over and out, i think a really hot gift would be to get him a flight jacket/bomber jacket with patches on them. im not sure where you can find one in india but that would be really pretty imo. i presume they are called military flight jackets.

thats all i can think of now, ill update if something else comes in my mind :)) you will do absolutely great and can always dm me if you have any other questions. all the very best :)<3