terms, vocabulary, grammar

Can you correct the terms, vocabulary, verbal phrases and grammar in the sentences having to do with planes?

1- We are making are ascent. We are gaining altitude.

2- What is the worst turbulence you ever had on plane? This flight was full of turbulence.

3- We are more than halfway in the flight.

4- The plane lost speed as it began it's descent.

5- What takes 2 hours to do by car takes 30 minutes by plane.

Thank you in advance