I think it's because the station access fee still applies at the airport stations

A bit old, but from the internal website saying Region 8 should be announced sometime this month, with Region 7 to be in July https://s3-ap-southeast-2.amazonaws.com/ehq-production-australia/26edbdd8b83e99b332ebbc6bde778d95e3491ef8/original/1600036908/Timeline_graphic_updated_0920.pdf_c25e1f3ce917cb...

Why have they not renumbered the L24 to 324X?? It will be the only STA route that doesn't conform to the new 3 digit numbering rule (except for the B1 I guess). I mean, it probably doesn't even need to exist, it doesn't skip that many stops, only runs twice in the AM peak, and the passenger load was...