I have a counterpoint to the Air Canada anecdote that Matt shared earlier. Back in July 2022 I was flying back to Sydney with Air Canada (in business class if that means anything) connecting in Vancouver from Toronto. I arrive in Vancouver at 9:30 PM and walk the 50 metres to pass the passport check and enter the international departures concourse (where the International Maple Leaf lounge is). I immediately head to the lounge and do my normal routine (shower, meal, etc.) as boarding was to be called soon. To my surprise, the flight gets delayed by about 2 hours. At the same time, AC37 (the only other flight that night in the international area) also to Sydney was also delayed. Nonetheless, the lounge remained open well past its 23:00 closing time. Could it be that maybe this was the international lounge, and so there is more of an expectation that services like lounges be open? I'm not certain. But I think that raises an important question, do lounge opening policies vary between domestic and international terminals even for the same airline? For instance, would the Qantas First lounge close in Melbourne even if the last QFi of the day hasn't yet departed?
In terms of what airlines should do in these situations, I do have some thoughts. First, they can provide passengers in the lounge with a parting gift (i.e. a bag full of snacks and light food options) before they leave the lounge. In that way they can have something to eat as usually for late night departures all the restaurants and concessions are closed. A more ambitious thing would be having a lounge within a lounge concept which consists of a small room cordoned off for these late delays. In this way, the cleaners can do what they need to do, and then when the flights are called the room can also be closed and cleaned. Part of it is also the fault of the airport authority. I mean if the airport had plenty of seating with tables you can work from, that would be one thing. But generally with my experience at airports you are lucky to find a seat (and a powerpoint).
-RooFlyer88