There's an unwritten rule when you're travelling on a plane not to recline your seat the whole way. Just out of courtesy to the person behind you. However some people do still stretch back so that they're practically lying flat.
So now there is a product to stop this from happening. It's called the 'Knee Defender' and locks onto the seat in front so that it cannot recline fully.
It even comes with a warning.
These new gadgets have been the cause of a number of rows on board. One recently resulted in the plane having to divert.
