Top Indian airlines Air India and IndiGo are facing higher fuel costs and longer journey times as they reroute international flights after Pakistan closed its airspace to them. The closure comes amid escalating tensions over a deadly militant attack in Kashmir. Flights to destinations in the West and the Middle East from New Delhi will be most impacted, with Air India's flights to the Middle East being forced to fly an hour longer, resulting in higher fuel costs. The closure is the latest challenge for the Indian airline industry, which is already dealing with jet delivery delays and rising fuel costs.