Based on this evidence, should we all be driving burger shaped cars?
Pure aerodynamic analysis heavily favors trains as the most efficient means of transport. There's far less drag per person, even if a train is well under capacity, even if the train is moving twice as fast as even a burger shaped car.
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.
The SR-71's top speed was 2,200 mph. 2,200 mph = 139,392,000 iph (inches per hour). Typical hamburger patty is about 5" in diameter. 139,392,000 / 5 = 27,878,400 cph (cheeseburgers per hour), or as the original question asked, 1,672,704,000 cpm.