Well, "permeant" does not make sense in this context, and the name was added by a relatively inexperienced user, so a typo is not unlikely. Official websites e.g. http://hkpaff.com/ https://www.hongkongairport.com/en/the-airport/aviation-logistics-services/ https://www.epd.gov.hk/epd/sites/default/files/epd/english/boards/advisory_council/files/ace_paper_2007_10_AnnexC.pdf also agree with "permanent".

Resolved via https://www.openstreetmap.org/changeset/176396214 ; closing.