I can't understand this
U mean usa having hands in our upgrades
Then what could be possible changes
I don't think so bcoz helis ok but aircrafts not possible as the lifts there are very small so only possible refits could be ew or some mechanism or techniques or few other subsystems
But even that we must do it indigenously as we have capability to make advanced marine ew systems, subs detection systems and countermeasure systems
Then where does usa comes
The USN's participation in our carrier program is official. IN-USN Joint Working Group on Carriers. The US Delegation even had a thorough inspection of the new Vikrant while she was some ways off from launch.
IN delegation has been given a thorough tour of the Ford class carriers.
I dont want to say much but lets say ships are easy to reconfigure and the time taken by VKD is long enough for great changes to her hangar and hull work.
Also note where exactly the IN undertook the refit - Naval dockyard, Karwar - the best place to maintain opsec.