The flight attendants were acting as if they were better than their passengers.
The cabin crew was acting as if they were superior to their passengers.
1) The flight attendants were acting as if they were better than their passengers.
「客室乗務員は乗客よりあたかも優れているかのように振る舞っていた」
2) The cabin crew was acting as if they were superior to their passengers.
「客室乗務員は乗客よりもあたかも(立場的に)上かのように振る舞っていた」
flight attendantやcabin crewは「客室乗務員」、passengerは「乗客」です。
actは「振る舞う」、as ifは「あたかも~だ」です。