An aircraft registration is a unique alphanumeric string that identifies a civil aircraft, in similar fashion to a licence plate on an automobile. In accordance with the Convention on International Civil Aviation all aircraft must be registered with a national aviation authority.Each country has its own registration code with a unique code just as each state has one in automobile registration in India .For India it is VT.

What douse Vt stand for??? 

Hint:(Its been really controversial )

Ans:Viceroys Territory or Victorian Territory(as pointed out by Sourabh Rao)