Could it have been an Australian based aircrew/cabin crew! These guys are able to isolate at home after their duty. At the height of the Melbourne 2nd wave I was talking with a crew member who was paxing to Sydney (Melbourne based) fly internationally enter back via Sydney and then pax back to Melbourne no quarantine in SY and paxing on a flight full of pax no less than hrs after arriving. That there is the loop hole, if you want to wok you have to agree to hotel quarantine thats how it should be moving forward the risk is to great top everyone else.