Having just caught up with an Albury local, the local parlance for this airline is Jet NoGo....
Very funny: amazing what witty individuals can come up with.
I have not travelled on this airline (and won't in the near future with the very high fares it charges) but from observation its greatest problem is the tiny fleet that inevitably means if there's a problem with an aircraft, no spare is available...anywhere. Full stop (or as the Yanks say 'period.')
I must miss many of the problems as none of us can monitor every flight, but it would not surprise if it's had far more cancellations than I've popped on this attempt at recording delays and cancellations.
Having serious delays (and cancellations) is an impediment to the travelling public having the confidence to book, so with those in the know avoiding JetGo, this must have a negative effect on revenue.
The conundrum for a small business like this must be that expansion even if secondhand aircraft are acquired is very expensive, there are larger competitors such as ZL, the passenger market on routes like BNE to ABX must be pretty small, staffing costs are high and bookings perhaps largely from agribusiness sector (the strength of which is partly linked to rainfall v droughts), government officials including local govt and a few leisure travellers.
If you book on surface transport such as NSWTrainLink, or QF/VA, you know that if there's problems they'll normally get you to where you're going on the same day. Can we be sure this occurs with JG?