The song: "September" by Earth, Wind and Fire.
The place: the Finnair Crew Lounge at what we're assuming is Helsinki Airport
Finnair has already posted it on their own YouTube, so this could be a publicity stunt, but the fact they didn't involve any passengers (or public) leads us to believe this is just what it seems; a few flight attendants got an idea, got their friends to play along and then alerted the airline to the fun, who were game to support it.
Cute! Keeping their black leather gloves on was a nice touch.
Click here to read how the Flashdance was organized.