I respect everybody's opinion on such a marvelous aircraft as the mighty B747, one that had a twist of luck with an example of "unintended consequences", this time a favourable one, after being dumped for the next large airplane military transport candidate, the one race wher the C5 got selected. But Boeing was thoughtful enough to offer the model to the civil sector and won the bet.
But I have to argue that besides the DC3 and the 747, the one airplane that I consider to have made a much bigger impact in the technological arena, and one that has not been surpassed, is the BAE/Aerospatiale Concorde. People travel at speeds twice the speed of sound became a true modern time travel machine, citing the fact that the Concorde would take off from Paris or London, cross the Atlantic, and arrive at a time earlier than the time it departed. The idea of joining two points in the world at such speed is a feat that has yet to be emulated. Only when we are able to teletransport will the speed of supersonic travel be obsolete.
Yes, it did not win many adepts in the economical arena, nor did it became available to the masses, but neither is the SR71, nor the F15, or any of the Mirage, Sukhoi or any other supersonic military aircraft. I believe it is only a matter of time before there is an alternative means of supersonic travel, at an afordable price, that will substitute and become the norm for travel from point to point. We have seen over the years that the faster we can move from point a to point b the form or means of transportation evolve. That's why we travel by ship only for entertainment, and not for adequate transportation.