some airlines have empty seats closer to the back of the plane, everytime I travel internationally people always seem to want to sit nearer to the front when they fly but me i am happy to be sitting in the back hopefully having more than one seat so i can put my feet up some of the journey....

If i saw someone do that i would say well done as we are all the same with wanting something more for less, but nothign is guaranteed so if you want to guarantee more space then pay for it