I have a question for my parents that I actually can't find an answer to.

tonight my parents are flying akl-hkg-tpe on HX
the connecting flight HKG-TPE is on BR but the ticket is a HX codeshare number.

what are the lounge access rules for the transit on HkG? the whole ticket is in business. will she go to the lounge of the marketing carrier (HX) or the operating carrier (BR), which in this case would be a *A lounge in HK I guess?

many thanks!