What's the correct plural of person? Persons or people?
Both are correct and both are required in English language, you just have to know how to use them.
People denotes a group, an unspecified number of people, for example:
The people in the area have been warned about the possible risks.
Persons refers to persons individually and denotes an exact number which can be, or should be able to, expressed in numbers, for example:
Which persons are responsible for this fire?
Remember that persons is usually used in law and legal documents, like:
Lessor shall not be responsible for damage to Lessee’s vehicle, whether or not such damage is caused by other vehicles or persons in the parking lot and surrounding area.
Only such persons who are nominated in accordance with the procedures set forth in this section ...