BBC News
Peter Hoskins

Though Hong Kong has recorded barely any local coronavirus cases in recent months, the city has imposed an extensive testing and quarantine regime, in line with mainland China's zero Covid policy.

Pilots are not exempted from these rules - which means they spend an exceptionally large portion of their time either working or in quarantine.

These tough measures start at the airport.

All international inbound travellers have to take Covid-19 tests on arrival at Hong Kong airport and quarantine even if they test negative. They need to wait for their test results - which are made available on the same day - before they can proceed with immigration procedures.