You don't need a passport to travel between England and Scotland. They are both part of the UK. However, most airlines now insist that you produce a valid photo ID before you board an aircraft - regardless of where that aircraft is flying to. A valid passport - from any country - is the easiest way of doing that.
No, for domestic flights, you will need a form of photographic ID, not necessarily a passport.
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
Nobody requires a passport to travel between London (England) and Scotland, as both are part of the UK.
Yes
Some airlines require passport or driving license while others e.g. bmi or BA do not ask for identification.
No sorry
no dumasses
yes
No, as long as you are a passport holder of England or USA, you can fly in between without a visa
yes