You do not need a passport to fly from London to Newcastle-upon-Tyne, as both locations are in the UK, however it is always best to take your passport with you just in case.
Yes, always.
No you need a passport.
It is regarded as an internal flight, but you should bring a passport with you any time you are flying.
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.
Probably. You do not need a pasport but you do need photographic identity. Check with the airline.
Best to fly.
Yes, babies need a passport to fly internationally.
No, you shoudn't because it is part of the United Kingdom.
Yes - and it has been the case for a long time. However, you do not need a visa and it is extremely unlikely you will get your passport stamped