Currently Kolkata airport lacks any direct link to Europe, so people travelling to European destinations have to fly via Delhi, Mumbai or Middle East hubs. Even smaller cities like Ahmedabad and Amritsar have direct flight to London and Birmingham via Mumbai and Delhi respectively owing to much larger diaspora from Gujarat and Punjab compared to that of Bengal. Kolkata's long-haul international market heavily depends on visiting friends and relatives (VFR) traffic which is often price sensitive therefore a sizable demand for economy-class seats exist but premier class (business-class or higher) demand remains low on European routes.
