Well looking at VA. SYD-PER was 94.4% for both departure and arrival. Yet PER-SYD was a shocking 22%
MEL-PER was at 70% but at about 34% for the other way.
But again, we should know the reasons for delays. Was it something the airline could have reasonably prevented.
I didn't say it was great, but just that for the most part the airlines tend to hover at the same averages. If one airline dips, the others tend to as well usually because they have been subjected to the same issue like weather, runway closures etc.
In an ideal world, it'd be good to separate 'airline' and 'airport'-caused delays. However there'd be innumerable arguments prior to publication, with resultant to-ing and fro-ing. Airlines no doubt regard it as 'not their fault', understandably, if users go for a wander in the terminal (or to the 'barrrrr' as JohnPhelan famously commented on AFF) and stupidly delay the plane as their hold luggage must be removed for security reasons, but again, that's part and parcel of operations.
It's akin to a suburban rail operator on one trip having five wheelchair users front up at different stations with most boardings delaying a train by a minimum of 40 additional seconds as a ramp is deployed if the platform isn't built up at that point.
Airlines are a mix of government-owned, public companies and private, sometimes 'family' companies. In surface transport where there are franchises and payments to operators vary according to how they perform with punctuality and cancellation rates against set KPIs, there are 'discussions' with government prior to figures being agreed. Often, government caves in and sometimes it's because operator(s) threaten to bring in solicitors to enforce what the company claims is the contract as it sees it.
Airlines and airports exist (in theory) to serve passengers, who only care about what time their flight arrives, not which entity is responsible. We have a responsibility not to delay a flight by stupid behaviour such as being so inebriated that the captain quite rightly kicks us off, but airlines also have a responsibility to be efficient. Boarding is often inefficient with passengers blocking the aisles as they search for space for 'all but the kitchen sink' that they bring on board.
Maybe airlines ought allow extra time at PER, although this may mean additional costs.
Are delays there due to being unable to receive the OK from ATC to depart (too much 'competing' air traffic and insufficient runway capacity), is it due to FIFO workers being slack in their boarding or connecting flights running late, are there delays with ground operations such as a tanker being slow to arrive that the airport will say with proper planning were foreseeable or are they due to occasionally, airline staff going off sick over there and hence at short notice another staff member has to be called in?
Getting back to Rex, my hypothesis is it will have a lot of trouble being punctual as it expands its network to other locations such as ADL and MCY, but has a tiny number of flights to each. We'll have to see in a few months how wrong I am.