비행기 오래 탔어요. - I took a plane for a long time.
비행기 오래 탔어요? - Did you took a plane for a long time?
긴 비행이었어요. - It was a long flight.
긴 비행이었어요? - Was it a long flight?
Acutally, they have same meaning but just difference of expression.
Your grammar is correct and choosing expression is up to you.
I hope my explanation will be helpful to you :)