Yes. The rules are the same whether you travel by train, by road, by air or by ship.
That said, there are some countries that allow you to travel between them with a national identity card. That would again be the same as for other methods of transport.
Yes, you need a passport to travel to Paris.
The ID is sufficient.
Yes, you will need on. Anyone flying out of the United States currently requires a passport. France will require a passport for entry into their country.
yes, you need to. <english oui, ehyoo ne'ed too. <french
Yes, you need a passport to travel to Europe.
You need a passport
No, you do not need a passport to travel to Arizona if you are a U.S. citizen.
Yes, you need a valid passport to travel to Brazil.
Yes, you need a valid passport to travel to Colombia.
Yes, you need a valid passport to travel to Peru.
Yes, newborns need a passport to travel internationally.
Yes, you need a valid passport to travel to Australia.