I am sorry Peter I am not certain if there are actually any Exclusive workers buses. I do know qantas used to have a single for their workers but unsure how many people essentially function in both of those terminals. Sydney Airport is really a Main international gateway to Australia https://sydney-international-airp63962.bloggerswise.com/37271612/the-smart-trick-of-sydney-airport-taxi-that-no-one-is-discussing