Why standing seats on airplanes does not happen ?

Low-cost airline Ryanair has a plan for standing seats on its planes, but airline experts say it will never happen. Why does the budget carrier come up with far-fetched schemes which often don't come to pass? A standing room only ticket is, traditionally, dirt-cheap. So it's easy to see why this idea appeals to both a no-frills carrier and its bargain-hungry customers. Ryanair boss Michael O'Leary - fond of speculating publicly about outlandish money-saving schemes - says his airline is considering vertical seats akin to bar stools with seatbelts. Despite talk of safety testing and tickets selling for £4 or less, aviation experts say such plans are pie in the sky. It's not the first time the airline has floated the standing seats idea, or indeed come up with headline grabbing schemes which fail to materialise. Charging passengers to use loos is another example, as is a so-called fat-tax - surcharging overweight flyers.