From what I have heard and seen (and very much subject to change)...
Regional Express (REX) operates 4 return flights a week with Pel-Air Metro VH-KDO from Brisbane to the following CQ mining towns...
- Moranbah on Monday morning returning back to Brisbane on Tuesday morning from Middlemount
- Emerald twice a week Tuesday night and wednesday morning.
- Middlemount Friday morning
Central airlines operate 2-3 flights a week Brisbane-Hervey Bay-Emerald, as well as 4-5 flights a week Mackay-Clermont-Mackay, both with PA-31 equipment.
General Aviation Maintenance (GAM) operate Brisbane-Chinchilla flights 10 times a week with Dornier DO-228 aircraft (VH-VJD).
Great Western Aviation (GWA) operate numerous flights via Brisbane, Toowoomba and Roma to various towns in CQ with their fleet of PA-31's and B200.
If you read this and know something more... please leave a comment!!