I recently flew LGA-MYR on a brand spanking new NK A320. Due to delays for storms in the NYC area, we arrived late, maybe around 9:30 PM. Our approach seemed unlike any other I'd experienced, as we seemed to descend to something like 1500 ft. several minutes from the fence. The altitude is a rough guess given my view out the window. I could, for instance, tell the difference between a car and a van driving on a decently lit road. What seemed strange initially was the fact the slats and flaps were not deployed. I've definitely never been that low in a commercial airliner on approach without the flaps deployed to some degree. The longer we stayed at that altitude, the weirder I started to feel about it. Finally the flaps did deploy in two steps to full landing config over about 30 seconds, and another 30 seconds later, we touched down.
TL;DR - We spent what for me was an unusually long time at a very low altitude with a clean wing, and then in the space of a minute or so, we got all dirty, descended, and touched down.
Is there a reason for such an approach? Was it unusual? My guess was that maybe noise abatement was the reason. Any insights appreciated.