https://www.cnn.com/travel/new-federal-rules-airline-refunds-cash/index.html

자세히 읽어보지는 않았고 링크로 대체합니다.

“If you get delayed significantly, that means three hours domestically, six hours internationally, or if there’s another significant change to your itinerary — like maybe you were going to go into one airport, they actually changed the airport on you or something like that — you’re going to get your money back.”

The rule would formalize the requirement he referred to that passengers receive refunds if a domestic flight is delayed by more than three hours or if an international flight is delayed by more than six hours.

이렇게 구체적으로 delay의 기준을 (국내선 3시간, 국제선 6시간 )specify한 규정이 원래 있었는지는 모르겠네요.