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.
no
No, for domestic flights, you will need a form of photographic ID, not necessarily a passport.
Yes
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 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 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.
Yes, you need a passport to fly internationally.
Yes, you need a passport to fly internationally.
Yes, you need a passport to fly out of Tijuana.
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.