New Delhi, Oct. 13 -- The government has stepped in to distinguish procedures for passengers travelling on interline and codeshare flights following an immigration lapse at Delhi airport last September month, when three passengers travelled to Italy without clearing immigration checks.

The incident came close on the heels of the government putting in place a hub-and-spoke model at the Varanasi, Amritsar and Ahmedabad airports, where passengers can clear immigration checks at the origin airport for international travel.

"Under the revised procedure, the second boarding pass for interline and codeshare passengers will be issued at connecting airports after immigration, instead of being issued at the originating airport," one of the offici...