Adding to the above as mentioned by blackbirdsr72
While ATF import has been permitted for all the above mentioned airlines....
They are facing difficulty in transportation and storage of the fuel once it arrives at the seaports in India . They have to spend more in money transporting and are finding it difficult to find storage space for the fuel .
This is because all the storage space for fuel at the airports are used up by the govt oil companies .
I read somewhere that SpiceJet had signed an agreement with Reliance for the transportation and storage of ATF . Not sure how far that is true .
In the present situation the best method for import of ATF would be none other than to import it in the fuel tanks of the aircraft when flying back from international destination.
Previously any aircraft bringing in excess fuel from abroad and wishes to continue on a domestic sector has to pay import taxes on the same . However if it continues onwards to an international destination it is exempt from doing so. So airlines would design their schedules accordingly
I am not sure though whether the above method is in use by any Indian airline at present or if its allowed by DGFT ( Director General of Foreign Trade ) in their approval for import of ATF