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"Philippine Airlines is one of the many airlines that have implemented additional safety measures to control the spread of COVID-19. Some of the new policies that have been implemented to accommodate travelers flying from San Francisco to Manila Ninoy Aquino Intl are improved sanitation, HEPA filters, mask requirements, social distance seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline."
<https://www.cheapflights.com/flights-to-manila/san-francisco/>