IT failure: PIA operations disrupted
Schedules of numerous flights were badly hit.
"PIA officials said they cannot yet confirm what caused the disruption," Dawn News.
Flight service of British Airways was badly hit recently due to IT failure.
The aviation giant's flight service are slowly becoming normal from Monday.
British Airways tweeted: "On Monday, we will run a full schedule at Gatwick and intend to operate a full long-haul schedule from Heathrow."
"With a high proportion of our short-haul programme. We apologise again to customers for the frustration and inconvenience," it said.
"They are experiencing and we thank them for their continued patience. We urge customers due to travel today," the company said.
"They are experiencing and we thank them for their continued patience. We urge customers due to travel today," the aviation major said.