There are two benefits of advance parole: (1), it enables an alien to return to the U.S. after traveling abroad without the necessity of obtaining a visa; (2), it preserves whatever Adjustment of Status (Form I-485) applications the alien has pending with the USCIS. When aliens are paroled outside of the U.S., all pending applications, such as the application for adjustment of status, continue to be effective.
Please note that aliens holding valid H-1 (temporary worker in a specialty occupation) or L-1 (intra-company transferee) visas and their dependents who have filed for adjustment of status do not have to file for Advance Parole for the purposes of maintaining their adjustment of status application, as long as their non-immigrant status does not expire before returning to the US. However, in this situation, they will still need a valid H-1 or L-1 visa to come back to the U.S.
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