Why Heathrow Airport Had Empty Flights to Nowhere

Heathrow Airport in London is a huge global hub, but it only has two runways. Really. Landing rights at Heathrow are therefore extremely valuable to airlines, and some weird things can happen in order to keep those rights, like "ghost flights." The practice seems wasteful, but the airlines see them as an necessary investment. Half as Interesting, a channel from Wendover Productions, explains how that happened. This video slides into an ad at about four minutes. Also, I personally would not call Cardiff "Nowhere," but that's the title the video came with. (via Metafilter)