At the time of the 747 development program, the 2707 (American SST) was alive and well. Boeing and Juan Trippe at Pan Am both believed the 2707 and its family would take over from subsonic planes completely. The 747 has the "bulge" because the cockpit was located there to allow nose loading, because Boeing and Pan Am figured the planes would all be flying cargo in 10 years. Looking at concept cutaways, Trippe noticed the empty space behind the cockpit in the fairing. He asked what is was for, the response was "a crew rest or something." Trippe decided he wanted a First Class lounge, and the double-decker was born. The bulge not only allows the 747 to be one of the most successful freighters around, but improves speed and fuel economy, and maintains the world-renowned profile. After the intros of both the 747 and 777, passengers specifically requested these aircraft when booking. The VC10 also had such amazing passenger reviews that it was specifically requested over BOAC's 707 and Comet 4 fleet. The A380 will have the same publicity as the 747. Whether the reviews will remain so impressive, as they were with all 3 prior planes, remains to be seen. Hats off to the 747. Did you also know that the 747 cross-section was determined by drawing circles around two LD3 containers? The 747 was not intended to do what it has done. It was an amazing coincidence. In the end, the 747 "frieghter" has sold nearly 1000 planes, become a global icon, been a massive moneymaker for Boeing, and made Boeing a household name throughout the world. The 2707 is now represented by a rotting hulk in a junkyard in Florida.