It would depend on the airline and the country. Some will allow anyone with a passport of their own to travel alone, but others will require parental consent for anyone under eighteen.
Travel within a country generally doesn't need a passport, and certain countries have agreements to allow passportless travel between them, but otherwise, no.
the Fire Nation is ~*clearly superior*~; obviously they have tons of things that Earth doesn't
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But they have passports in the Avatarverse. It's even a plot point in The Serpent's Pass.
she doesn't know they exist on Earth though
Why, is she stupid or something? Yuk-yuk-yuk.
the Fire Nation is ~*clearly superior*~; obviously they have tons of things that Earth doesn't