Icelandair 757 buzzing the city center and not just a Fokker from Flugfélagið or a private jet that is coming in for a landing at the domestic airport which, of course, we're all used to.
I don't know if there was any specific reason why it landed in town instead of out at Keflavík, but don't be surprised when you visit if you hear the sound of an incoming plane. You might even make it a game to see if you can get an awesome belly shot as it zooms past overhead!*
*The best location for this is out at Hljómskálagarðinn by the town lake (link is to a photo and post by Professor Batty.) Oh, and here you can watch a live cam feed of Tjörnin, the town lake : )