After watching a few aircraft making their approaches, you get a feel for how high the jets will be at a given point. Any variation from this seems pretty different, even if it is not really that large. A Korean Air A330 made its approach and it seemed noticeably lower to me. There was a displaced threshold in operation so maybe they were aiming a bit closer to the piano keys than normal. They didn’t do anything untoward but it did catch my attention.