IndiGo CEO Willie Walsh says the airline will operate from Mumbai’s CSMIA and Navi Mumbai airports, calling NMIA a major expansion opportunity. IndiGo intends to operate from both Chhatrapati Shivaji Maharaj International Airport (CSMIA) and Navi Mumbai International Airport (NMIA), with the latter presenting a major opportunity for the airline’s expansion in Mumbai, said IndiGo CEO Willie Walsh.