Pakistani airspace on its eastern border with India will remain closed until June 14, a civil aviation official said on Wednesday, the latest extension months after a standoff between the arch rivals.

Pakistan closed its airspace in February after a suicide attack by a Pakistan-based militant group in Indian-controlled Kashmir led to aerial bombing missions on each other’s soil and a fighter dogfight over Kashmir.

Foreign carriers using Indian airspace have been forced to take costly detours because they cannot fly over Pakistan. 

“The closure will continue until June 14,” a spokesperson for Pakistan’s Civil Aviation Authority told Reuters, without giving further details.

Pakistan lies in the middle of a vital aviation corridor and the airspace restrictions impact hundreds of commercial and cargo flights each day, adding flight time for passengers and fuel costs for airlines.