
According to the letter, the unreliable PIA flights schedule has caused inconvenience to residents of Gilgit-Baltistan. The tourism industry of Gilgit-Baltistan also suffers losses due to unreliable PIA service.

Gilgit Airport is served by PIA ATR turboprop aircraft flights to & from Islamabad. Apparently only one ATR 42-500 aircraft registration AP-BHI is currently active in PIA fleet.
https://www.flightradar24.com/data/aircraft/ap-bhi
Last year, Supreme Appellate Court Gilgit-Baltistan directed Pakistan Civil Aviation Authority (CAA) and Pakistan International Airlines (PIA) to submit a report on the operational life of PIA ATR aircraft deployed by the airline on flights between Islamabad and Gilgit and reasons behind technical faults in these flights.
Abbas