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if you live anywhere even near an airport, in the vicinity of most capital cities you are probably used to seing planes already on their approach run. Planes start to desend (or haven't made it to their cruising altitude) for several hundred kilometers away from the airports. You get used to seeing planes flying relatively low.
An average cruising altitude for a jet liner is about 35000ft in the old scale, or roughly 12000 meters, 12km! That's pretty high. In Europe, where there are a LOT of flights traveling overhead it is a lot more common then Melbourne where almost all of the flights anywhere near there ARE either coming or going from the airport.
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