What percentage of international flights departing from Manila airport (MNL) are cancelled because of Duterte's lockdown on Metro Manila because of COVID-19 from 2020-03-15 to 2020-04-14?
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Answer
I haven't seen any major cancellation so far between 2020-03-15 and 2020-03-19 for international departing from MNL From 2020-03-20 00:00 all flights were supposed to be canceled according to the "enhanced" lockdown announced on 2020-03-16 evening but the ban was later lifted for non-Filipino citizens on 2020-03-18.
https://mnlairport.ph/flights/cancellations lists flights cancellations.
Before 2020-03-19:
https://cnnphilippines.com/business/2020/3/13/airasia-suspends-flights-.html:
PAL [Philippines Airlines]'s international flights from Manila will continue during the period, it added.
https://newsroom.airasia.com/news/2020/3/13/updated-as-of-13-march-2020-travel-advisory-airasia-cancels-domestic-flights-from-manila-as-ph-government-implements-new-travel-restrictions: only mentions domestic flight from/to MNL cancellations.
https://www.manila-airport.net/naia-departures?day=tomorrow (mirror) doesn't seem to show any cancellation, but weirdly domestic flights aren't canceled either, so I doubt it is accurate.
[Updated as of 14 March 2020] Travel Advisory: AirAsia cancels domestic flights from Manila as PH government implements new travel restrictions
From 2020-03-20:
The airline will announce the status of its international flights from March 20 to April 12 at a later date, as it coordinates with authorities.
https://www.pna.gov.ph/articles/1096970:
The Department of Tourism (DOT) has lauded the lifting of the travel ban on outbound passengers, except Filipino tourists, in line with the Luzon-wide enhanced community quarantine.