There is no longer a lounge that you can access in Kolkata if flying SQ J. Instead I was given a S$20 voucher to use on inflight shopping. Doesn't help you much in the airport!
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No Air India or Oberoi Clipper lounge?
As mentioned you do not need *Alliance status to access a *Alliance lounge as a business class customer on a *Alliance flight. Same as Oneworld.Maybe if I had sufficient Star Alliance status I may have been offered an alternate lounge, but I was "jus" a J passenger.