MMOC is open. In Oct. 2020, the mandatory 14-day quarantine was dropped.
In the meantime, several evolving changes have been made that allow entry
into Hawaii without quarantine requirements. Currently (late Aug. 2021):
Hawaii travelers still have to submit required information on the Hawaii
Safe Travels website BEFORE travel. To enter without required
pre-testing, quarantine, etc., travelers must be fully vaccinated and
supply proof of vaccination (e.g., a completed vaccine card) online and
in-person. Carefully research current Hawaii Safe Travel rules before
boarding a plane.