Task: Translation
Input (Japanese): 氷結が要因であったことが明らかになり、氷が777の燃料システム内で蓄積するのを防ぐために、ボーイングは事故の後、新しい手順をすでに開発した；そして、デルタ航空乗務員が従ったのはこれらのいくつかだった。
Output (English): Boeing has already developed new procedures after the crash to prevent ice from building up within their 777 fuel systems after it became apparent that icing may have been a factor, and it was some of these that the Delta flight crew had followed.