Salaah on a Conveyance

Q: I travel a lot across countries and most of the time I perform my prayers in a plane. What is the correct way of praying while in a plane and what timings do I follow?

Q: If a person is standing and performing Salaah in a bus or train, does he have to face the qiblah in the beginning only or for the full duration of the Salaah? If the bus moves away from the qiblah what should he do?

Q: Is it permissible to read Salaah while travelling in a car/bus / train by sitting (as there is no place to stand)? Is this permissible for all Salaah including fard? If standing is a pillar of fard Salaah, upto what duration the Salaatul qasr is applicable in case of return journey within some days.

Q: With regard to travelling on the plane and the time of Salaah setting in particularly Maghrib. Often there is a clash between time of Salaah and the passengers busy seating themselves making it difficult to go to a space and perform Salaah. Otherwise the direction of qibla may be difficult to face.

Lastly is it permissible in such circumstances for a person who is completely fit to sit and perform Salaah in his/her seat?

Q: My husband lives in japan. He is driving whole day. Some times he couldn't fine a place to pray on time. So he turns the car to the qibla and pray inside the car while sitting. Is it acceptable?

Q: If a driver on the motorway needs to pray salaah, what does he do? Does he either pray sitting down, or reach his destination and pray standing up even if it means praying Maghrib and Esha together?

Q: If a person has completed the Salaah on the plane, sitting on his seat, it says in Fataawa that this person will repeat his Salaah after. But if he comes to his house before the end of the time of Salaah, he will repeat two or four rakaats?

Q: My wife and I do a lot of travelling by car. A lot of times the distances we drive are over 90km. Due to this, sometimes we have to pray on the side of the road or in a parking lot. If my wife prays outside the car like me, there are many people (men and women) who walk and drive by and could see her. In this case, is it permissible for my wife to pray sitting down in the car?

Q:

1. Is it necessary for me to repeat my salah that I prayed on an aeroplane?

2. If yes, then can I always sit and pray my salah in an aeroplane?

Q: A person is a musafir, visiting a city and shortening his prayers during his visit. May he pray his sunnah prayers sitting on a horse/camel/car whilst in this city (facing any direction) since he is a musafir? Or is this never permissible inside cities?