The answer is 'it depends'. How many passengers on the flight? Is it a long-haul that offers real food or a short hop with just cookies and pretzels? How burger-heavy is that airline's menu? Shockingly, some don't even offer burgers at all. Also, at which stage of the flight are we? Have some of the burgers already been consumed? If so, do they still count? What about burgers eaten before the flight but still in the stomachs of passengers? Or even burgers eaten long before but subsequently converted into bodily tissue? It's not as straightforward as it might seem at first glance.