None, within the United States. A passport if they are leaving the country.
Well flying anywhere requires you to have some sort of identification, but no if you are asking specific identifications for minors. Children under 18 can ask for extra care from the fight attendance since you are a minor by yourself.
No. But they will need appropriate identification if you wish to fly.
You do not need a passport to fly from Los Angeles, CA to Denver, CO. As long as you are a US Citizen, the only identification you will need is your driver's license or state issued identification card.
A photo identification is necessary to fly from England to Northern Ireland. The airlines prefer a driver's license or passport identification picture. The passport is not necessary if the person flying is a citizen of either country.
Some airlines require passport or driving license while others e.g. bmi or BA do not ask for identification.
Different airlines have different rules so it is best to check directy with the airline that you intend to fly with.
You need your identification documents and fare to fly to Dublin from Prestwick on a Ryan Air Ticket.
Hawaii is a US state - if you don't need a passport to go to Nevada or Michigan, you don't need a passport to go to Hawaii.
just your passport
If you're flying from the USA to Glasgow, Scotland, the answer is no. You'll need a passport at least. You also may need another form of picture identification. Typically this is a driver's license or state issued identification card.
I need help.
Yes, but you need a visa or some type of identification, when you get to the border you will be asked for it and the nature of your trip.