I dragged out an earlier "semi-scientific" survey of a basket of economy domestic fares that I did in Nov 2020, and then redid it with dates looking forward a similar amount of time, with same flight pairs (chosen because they had at least two competitors) and typical economy fares and the results were on first sight fairly surprising. Think of this as a typical travel budget spend for an organisation that still has some non-discretionary staff flying that it still has to do to maintain business to a minimum standard. Given that state border closures have continued to suppress a lot of demand but looking at seasonal factors and ignoring Covid-19 for a second - we always saw expensive fares in Xmas and New years holidays, but once school holidays were over, prices adjusted downwards as it has happened nearly every year.
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One of the interesting (but not surprising in hindsight) things has been the catastrophic drop in basic "no frills" inflexible Jetstar fares without baggage, obviously the lowest yield and most discretionary of passengers have gone on strike due to changeable state border closures and it shows in the fares. Virgin's drop in fares are about in line with fully bundled Jetstar and Qantas fares, maybe a bit worse, but not surprising given Virgin being in the news headlines for the wrong reasons for so long....
The other interesting thing has been the price premium that Qantas has been able to extract over Virgin has changed from a +19% price premium to a +22% price premium over Virgin. I would argue that Qantas's slightly better frequency/economy of scale, onboard product and having lounges open has allowed them to increase their yield premium over VA in the last few months, and I would bet that this price premium that they have been able to extract in J class fares would be even larger than the Y fares in this survey, even though all domestic airlines would surely be unprofitable at the moment, its just a matter of how unprofitable. Note the effect of another competitor Rex on the airfares between SYD and MEL, amazing what the threat of actual competition does even though they haven't started flying yet.
Obviously for people flying routes where there is no competition at all - I would bet London to a brick that airfares have gone up substantially.
Apologies I cant really increase the number of city pairs to make it more scientific/realistic as it would make comparisons with earlier "baskets of airfares" impossible to do.