I haven't traveled back to India since couple of years now. My mother is visiting me next month. Her flight is from Rajkot to Mumbai (Jet Airways Domestic flight) and than a connecting flight from Mumbai to Singapore(Also Jet Airways).
When I used to travel in the same flight I had to take an internal bus transfer from Mumbai domestic to international terminal to get to my international flight. One of my friend told me recently that this has changed now. The flight would directly go to the International terminal and then you get to your gate for the connecting flight.
Is this true? Do you no longer need to move between Mumbai airport terminals via buses?