separate line for OCI at airport immigration and custom in india

Nope. There are usually 2 lines ... Indians and Foreigners, but even that is flexible with handlers pointing you to different counters depending on the traffic. Also, while I recall separate queues (at least in theory) in Delhi, I remember combined lines in Bangalore. Separate line for OCI does not even arise with this situation, but you never know ... actually all my memories are pre-new airport in Delhi.
 
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