[wafflebear]

I believe "persons" is similar to "people" but differs in register.

For example, there is a UN Convention on the Rights of Persons with Disabilities. Obviously, native speakers would say "people with disabilities" in almost every situation, but that would be too informal for the title of a treaty.

Likewise, law enforcement use formal speech such as "persons of interest" to bolster their authority, but nobody would ever say "I sat next to two Australian persons on the flight".

[sverige]

Um, I'm a native speaker and might say "I sat next to two Australian persons on the flight."

Admittedly, it's more likely I'd say "I sat next to two Ozzies on the flight." (No, not Aussies, Ozzies. Like Ozzy Ozbourne. Because that's how it sounds to me when Aussies say 'Aussies.')