As it is an internal flight you do not need a passport. It is however required that you provide photographic ID generally, like your driving license. It is always best to check with the airline you are flying with as some of them may request to see a passport.
It depends where you are coming from. If you are travelling from England, then a drivers license should suffice but always check with your airline as they have different rules. If you are travelling from anywhere else it is likely you will need a passport and it's definitely a good idea to check before flying.
do i need i.d to fly from cardiff to glasgow airport ?
Glasgow and Wales are both part of the UK and traveling to either from the US requires a passport. Traveling between them does not.
yesyou do need a passport
Only the ticket and the identity card (or the passport for the citizens from non-EU countries).
no
No, for domestic flights, you will need a form of photographic ID, not necessarily a passport.
Yes
No, you shouldn't need a passport to fly from England to Scotland - although you will need photographic ID like a driver's license. It is best to double check with your airline before you fly.
No, you don't fly to wales, you just drive so it's alright (:
yes
You don't need any form of passport to cross the border between England and Scotland as they are the same nation. It's possible that the airline may require a passport for identification though.
No, you need one to get in and out of the country though. You might need one if you fly within the UK but you dont need one when going between England, Wales and Scotland by car. However, whether you technically "need" it or not, the US Department of State does recommend you keep your passport with you at all times when travelling abroad.
Your destination is irrelevant. It's your starting point that is important. Check with the airline that you intend to fly with as they all have different rules. As a general rule a passport and not a driving license would be necessary to fly into Scotland. It still depends on your starting point. If that is within Europe, you may not need a passport. As I said, check with the airline that you intend to fly with.
Most airlines will not allow you to board an aircraft without an acceptable form of ID. A valid passport is the most acceptable form of ID. If you haven't got a passport, speak to the airline that you are planning to travel with and ask them what will be acceptable to them. Alternatively, go by train.
Yes. You need a passport to fly anywhere.
Yes you need a valid passport to fly from Glasgow to Spain.