Passengers travelling through the Kolkata airport will now be able to check in for their flights and board planes with facial recognition technology as DigiYatra was rolled out here on Friday, an official statement said. Netaji Subhash Chandra Bose International Airport is the fourth one in the country after airports in Delhi, Bengaluru and Varanasi have the facility that provides a seamless entry and embarkation process for air passengers.‘DigiYatra’ was rolled out in those three airports in the first phase in December last year.