I am travelling from US to India via Air France - CMH--->DTW--->CDG--->IGI. but due to some technical difficulties in plane I missed the connecting flight. Now AirFrance has given me another ticket of AI flight late in night to IGI. I need to know how my baggage would be transferred as the AI terminal is far from the AirFrance terminal i had to take a train and bus to reach the AI terminal in CDG.
When you checked in for your first flight you were given a baggage receipt. It is a small sticker and it is often stuck to the back of a paper boarding card or (irritatingly) your passport.
The receipt looks something like this: but yours won't be green.
At least an hour before your flight, find an Air India staff member (at the check in desk or at the gate, before boarding has begun), present the baggage receipt and the boarding pass and ask the agent to confirm your baggage is on the cargo manifest to be loaded onto the aircraft.
At this time there is still time to find your bag if Air France forgot to tell Air India about your baggage.
The actual practicalities of how baggage is moved around the airport is not really very interesting. Newer airports have extensive underground baggage train systems controlled by computers. But in most airports a guy will just pick up your bag with the other interterminal transfer baggage and drive it on a truck to the other terminal.
Baggage transfers are handled using trailers hauled by small motorized tractors. These vehicles can easily travel between terminals. There could be a baggage conveyor system connecting the terminals, but if there is not, your bags will be taken in this or another sort of vehicle.
In case your baggage does not get to the flight you are on, it will be sent on a later flight and, generally, delivered to you.