So Australia has a 7 day average of Covid of 28000. So just let us presume that there are 28000 asymptomatic cases. That is 1 in 1000 Australians have asymptomatic Covid per day. That is just 40% chance that just 1 of them will be on the 400 seat planes you travel on. So you insist that 399 people who have no need to wear a mask must do so. YMBAVIP.
Ahh, but some of them may have influenza, which we know can be just as, or even more, dangerous than Covid
Assuming a person infected with influenza wearing a mask will help minimise the spread of influenza just as much as Covid.
Just noting that it makes sense to me to include influenza with Covid in the debate since they seem to be similarly contagious, can be similarly dangerous to catch, and I expect a mask worn by an infected, symptomatic and infectious person would provide similar protection reducing the likelihood of spreading their infection to others.
But the best way for me to protect myself from catching influenza or Covid from someone else is to be vaccinated and practice proper hand hygiene - wearing a mask will not stop me catching it if I remove the mask and eat something using my hands after touching something contaminated by another infectious person (a hand rail, a door knob etc.).
The best way for me to minimise the risk of spreading an infection to someone else is to wear a mask if I am experiencing any cold/flu-like symptoms and not able to remain distanced from other people. While there is a risk that I may be asymptomatic or early-infectious pre-symptomatic, I think that risk is small and acceptable.
Lets encourage people wear masks if they have any flu-like symptoms or if they feel better protected by doing so, and not make people feel uncomfortable wearing them. Its not a binary choice (pro-mask or anti-mask) so lets not berate people or tell them they are wrong because they choose to mask-up or choose not to mask-up when they have no symptoms. However, I do think anyone who has flu-like symptoms and does not wear a mask in public is being selfish - I don't want them sharing whatever they have, whether is a cold, flu, Covid or something else. Mask-up and keep it to yourself if any symptoms at all.