IndiGo said about 50 international routes may be adjusted slightly. It also said it was cancelling flights to Almaty from April 27 until at least May 7 and to Tashkent from April 28 until May 7. Indian airlines’ expansion plans have already been complicated by delivery delays from Boeing and Airbus.

Indian airlines Air India and IndiGo are bracing for higher fuel costs and longer journey times as they reroute international flights after Pakistan shut its airspace to them amid tensions over a deadly militant attack in Kashmir.