spoiled seat
n.— «The revenue lost by leaving a seat empty—a spoiled seat, in industry parlance—typically exceeds the cost of compensating a bumped passenger. Only fear of angering people keeps airlines from overbooking more.» —“Bumped Fliers and No Plan B” by Jeff Bailey in Phoenix, Arizona New York Times May 30, 2007. (source: Double-Tongued Dictionary)
Further reading
Have you ever googled your own name and found someone else who goes by the very same moniker? There’s a word for that: googleganger. Plus, the language of hobbyists and enthusiasts: If you’re a beekeeper, perhaps you call yourself a...
The word nurdle, sometimes spelled nerdle, can be used to denote various “small bits of things,” such as styrofoam packing material or detritus in one’s pockets. It may be related to the word nodule. Like thingamabob and whatsit...