目前是原双机组返回；但机组不能下飞机，否则14天隔离。改正：DL287 是经停首尔的。

A spokesperson for Delta insists that the airline was left with no choice but to cancel the flight because rules were changed after departure.

“New procedures required at Shanghai Pudong International Airport were implemented while it was en route” a spokesperson said of Tuesday’s scheduled service from Seattle to Shanghai.

“The new procedures require longer time on the ground than Delta is able to schedule there,” a statement from the carrier continued.