Advance parole allows you to travel back to the United States without applying for a visa. A transportation company (airlines) can accept an advance parole document instead of a visa as proof that you are authorized to travel to the United States. An advance parole document does not replace your passport.
Please note that having an advance parole document does not guarantee that you will be allowed to reenter the United States. At the airport or border, a U.S. Customs and Border Protection (CBP) officer will make the final decision about whether to allow you to reenter the United States.
Advance parole is most commonly used when someone has a pending: