Reports suggested at least 18,000 passengers were grounded after the services in and out of Gatwick and Heathrow — Britain's busiest airports – were cancelled.
The airline says a "systems issue" is causing delays and cancellations Wednesday for short-haul flights from Heathrow, Gatwick and London City airports.
International airlines including British Airways and Cathay Pacific have drastically truncated routes to such places as northern Italy and South East Asia as demand sharply plummets.
Airlines around the world said they would make more drastic cuts to their flying schedules, shed jobs and seek government aid after countries further tightened border restrictions because of the fast spreading coronavirus.
The British flag carrier has massively reduced flights and warned it will need to cut jobs to survive the emergency as the battered aviation sector frantically seeks to take out costs.
British Airways (BA), the world’s largest operator of Boeing 747s, will retire its entire jumbo jet fleet with immediate effect after the novel coronavirus pandemic sent air travel into freefall.
The Anglo-Spanish group, which also owns Iberia and Aer Lingus, just renewed a 750-million-pound ($955 million) partnership multi-year deal with American Express.
The first flight PK9702 will carry more than 250 passengers from Manchester to Islamabad and the next flight PK9785 will airlift passengers from Islamabad to London are scheduled for Aug.14 and 15 respectively, PIA spokesman Abdullah Hafeez said.
The British Airways owner IAG reassured investors with profits in line with expectations despite a tough fuel and trading environment, which has hit other airlines. Rivals such as EasyJet and Lufthansa have reported losses for the early months of 2019, but IAG said first quarter operating profit was 135 million euros ($152 million)