In QLD you are only deemed to be a close contact basically if you live with someone who has Covid (ie more than 4 hrs contact in close proximity in the same household). Apparently you're immune if this occurs in the workplace or public, but go figure. Under that logic, I would have to be in the same fairly small confined space as a confirmed Covid carrier for at least 4 hrs to even be considered a close contact, let alone what the odds are of actually catching it during that time. How long in general does anyone stand in close proximity to the same person while at an airport? No way would it be anywhere near 4 hours. You probably have the same chance of breathing in the cough of a covid carrier standing in line at security or the boarding gate as in the line at the supermarket checkout, or on a busy Saturday morning in Bunnings. But where do you have to wear a mask? Only at the airport. Crazy and non-sensical.
Southern states are looking at imminently scrapping their close contact definitions, making masks in airports even more absurd.
You don't have to sign in at the airport, they don't contact trace positives, they don't declare hot spots anymore, the police don't enforce mask wearing, we are almost all double vaxxed as a minimum. Why bother?