As soon as I saw this I was thinking this is over the top. No one will ever want to fly this way. But then a few moments later I thought, well maybe if it is cheap and the flight is short people just might. We travel on subways and buses standing at times. Why not planes LOL
One Day, That Economy Ticket May Buy You a Place to Stand
NYT - The airlines have come up with a new answer to an old question: How many passengers can be squeezed into economy class? A lot more, it turns out, especially if an idea still in the early stage should catch on: standing-room-only "seats."