First they charged extra for food, then for checked bags... now airlines want to sell standing room only "seats" on planes. From today's USA Today:

At least two carriers, one in Europe and one in Asia, are seriously considering it. Spring Airlines, a 4-year-old carrier that calls itself China's first low-cost airline, is seeking permission from that country's aviation regulators to reconfigure its planes to allow some stand-up "seats." Standing passengers would pay less than their conventionally seated fellow travelers....

Meanwhile, Ireland's Ryanair, arguably the world's most innovative low-cost/low-fare carrier, says it, too, will sell standing-room-only tickets if the Irish Aviation Authority will change its safety regulations.