After a short delay I was able to board my flight. As we sat on the tarmac the flight attendant explained that the rear of the plane was not full and we wouldn’t be moving until someone took those seats. I had paid extra for my 2nd row seat at check in with American but I eventually caved and moved due to the policy of American. I wasn’t thrilled about sitting there all night so someone had to do it. I wasted my money on that seat upgrade due to a policy that seams a little ridiculous. Those back seats weren’t even available when I booked.