I would be inclined to go for the 747, as it is the epitome of the progress made by mankind in the area of Passenger (and cargo) flight.
Although there are many Miliarty aircraft that could be referred to as the epitome of progress there, I think those who died, did it for the betterment of mankind, to bring people closer together, rather than the destruction which is, unfortunately, a part of the Military application of flight.
P.S. Don't forget Sir Charles Kingsford Smith..........
