Are US citizens allowed to fly anywhere outside the 50 states without a passport?

For US citizens, are there any locations outside the 50 US states that don't require a passport to fly to and from?
Best Answer
US, Canadian, and Mexican citizens can fly between the US and Canada on their NEXUS card. http://www.nexus.gc.ca/prog/nexus/menu-eng.html
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Can a US citizen be denied entry back into the USA?
Once disembarked from the plane, you will have to go through an officer that will ask for your travel documents and your visa. If they determine that you are not honest or that you have violated your visa terms, they are entitled to revoke or cancel your visa, and to deny your entry into the United States.Can you travel anywhere as a US citizen?
As of October 1, 2021, US citizens can travel visa-free to 185 countries and territories (though a few require a visa on arrival).Where can US citizens travel without a passport?
Where can a US citizen travel without a passport?- Puerto Rico.
- United States Virgin Islands.
- The Northern Mariana Islands.
- Guam.
- American Samoa.
- Canada.
- Mexico.
Can I travel out of the US without a U.S. passport?
U.S. citizens under age 16 may present a birth certificate or alternative proof of citizenship when entering by land or sea. All travelers must have a passport book for international air travel. Please note that hospital-issued birth certificates, voter registration cards, and affidavits cannot be used.What's the Furthest You Could Travel Without a Passport?
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Answer 2
US and Canadian citizens can use a NEXUS card to fly between the US and Canada.
In addition, a few Caribbean countries (such as St Lucia and - for Canadians - Bonaire/St Eustatius/Saba) let these nationals in (yes, by air as well) with a birth certificate and photo ID, or a certificate of citizenship/Canadian citizenship card.
Canada also lets US citizens in (flying from anywhere) with a US birth/citizenship/naturalization certificate.
However, for a US citizen to re-enter the US by air, a passport or (coming from Canada) NEXUS card is needed. Same goes for Canadians re-entering Canada by air other than from the US
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