Had we been flying to the USA over the ocean for some hours? Общий
Who had been flying to the USA over the ocean for some hours? Вопрос к подлежащему
We had been flying to the USA over the ocean for some hours,hadn't we? Разделительный
How long had we been flying to the USA over the ocean? Специальный
Had we been flying to the USA or to the UK over the ocean for some hours?
Альтернативный