日本語 
救急（救援）飛行
英語での表現＆単語の場合は品詞
mercy flight
（通例）可算名詞
（通例）可算名詞
英語例文＆出典
The staff and crew who participated in the mercy flight to Wuhan on 31 January to repartriate the Sri Lankas who were trapped in the city which is known as the epicenter of the coronavirus outbreak, have informed their employer---SriLankan Airlines---that the special allowance promised to them will not be accepted.
https://ceylontoday.lk/news-more/11509
※Ceylon Today WEB版の2020年２月４日の記事
A mercy flight carrying 112 Australian and New Zealand cruise ship passengers, as many as 70 who might have coronavirus, has landed in Melbourne from Uruguay.
※twitterの見出し
https://www.9news.com.au/national/coronavirus-crui...
A plane carrying up to 80 coronavirus patients is heading to Melbourne on a mercy flight home from South America.
※twitterの見出し
Four Qantas crew members who operated on a mercy flight from Chile have tested positive for coronavirus.
※twitterの見出し
https://www.skynews.com.au/details/_6147544232001
https://ceylontoday.lk/news-more/11509
※Ceylon Today WEB版の2020年２月４日の記事
A mercy flight carrying 112 Australian and New Zealand cruise ship passengers, as many as 70 who might have coronavirus, has landed in Melbourne from Uruguay.
※twitterの見出し
https://www.9news.com.au/national/coronavirus-crui...
A plane carrying up to 80 coronavirus patients is heading to Melbourne on a mercy flight home from South America.
※twitterの見出し
Four Qantas crew members who operated on a mercy flight from Chile have tested positive for coronavirus.
※twitterの見出し
https://www.skynews.com.au/details/_6147544232001
補足・特記事項など
隔離された環境にある人を救出するための飛行を指すものであり、通例往復を伴うものであるが、その片道の飛行に言及する場合は不定冠詞を伴う（出発地、目的地などが文脈から明らかとなっている場合が多い）。
難民等の救援のための飛行にも用いられる。
Yemen: mercy flight takes eight children to Jordan for treatment
※twitterの見出しの例。
https://www.theguardian.com/world/2020/feb/07/yeme...
難民等の救援のための飛行にも用いられる。
Yemen: mercy flight takes eight children to Jordan for treatment
※twitterの見出しの例。
https://www.theguardian.com/world/2020/feb/07/yeme...