In the United States, no, but you are asked to prove your age, you need some sort of document.
You need a passport when travelling to a country other than your own and when returning to your own country from another country.
Absolutely, you need a passport to travel from one country to another.
Yes. Whenever you enter another country by air, you need a passport.
You always need a passport to enter another country
No, you need a passport to enter another country.
If you are flying within the United States, you do not need a passport. If you are flying into the United States from another country, or out of the United States into another country, you need to present a passport at customs.
Yes, you do. Anytime you go into another country, you need a passport.
No, you will face difficulties. They need to see your entry stamp.
If its going into another country then yes you do.
No, if you are in the United States, you will need to obtain a USA passport to go to another country or to return. Within the 50 states, you will not need a passport.
You can fly anywhere within the borders of your current country.
If you are from another country yes. But if you are just from another city in Ireland then of course not.