From the other thread:

Just spoke with my contact at Club MoBay and both Timair and International Air Link are flying charter flights, no scheduled flights as the demand is too small at present.

Here is a page from the Sangster website that has all the contact information:

https://www.mbjairport.com/domestic-airlines

You can book when you get here but I highly advise calling them first. The plane needs to be readied and if they know that you are going in advance, they may be able to arrange the flight with more passengers which will greatly reduce your cost but may add to wait time.

There is no real waiting area other than a few chairs, so if your wait might be a long one, think about using the Club MoBay services. You would be able to relax, gets drinks and food, freshen up and they will escort you when the plane is ready.