No, but check with your airline.
Yes, children need passports to fly internationally.
Yes, children need passports to fly to Mexico.
No. But they will need appropriate identification if you wish to fly.
Check with BMI because different airlines have different rules.
Not even Ow.
Yes.
Yes.
Yes. Passport or another kind of ID.
some airlines require passports, some do not. Check with them. Immigration may ask for "proof of identity" passports are easier
Yes, you will need a passport to fly to your destination if it is located in another country. Passports are required for international travel to verify your identity and nationality.
Passports are usually just for international travel and are not necessary for domestic travel. You may need some kind of ID while traveling within a country.
No, for domestic flights, you will need a form of photographic ID, not necessarily a passport.