QUOTE(hksgmy @ Apr 25 2024, 10:55 AM)
Usually that’s all electronic now. I can’t say about KLIA, but if you don’t have a valid visa attached to your passport, Changi won’t even let you board the flight.
The ETA is linked to the airlines reservation APIS system (hence pre Covid, travel agencies easily get the ETA for you as part of their services).
When you attempt to perform an online check-in, the airline reservation system automatically verify with Australian DIBP if a valid visa it attached to that passport. If yes, you proceed to check in. If no, your check-in fails and you will need to go to the counter to see a human before the flight.
I fail because of the problem with the Malaysian naming system in the passport. There is no given name in the Malaysian passport! Your whole name is your surname. So my flight booking name (based on surname and given name) is different from the passport and visa name, no valid visa turns up on the check-in. The human at the desk will need to change your booking name to your passport name, and then your visa appears.
In addition, an officer will often be at the departure gate. They are trained to pick up suspicious behaviour (drug mules, plane jumpers etc) and are empowered to deny boarding to anyone if they are suspicious.