In 1965, Pan American World Airways president Juan Trippe phoned Boeing president Bill Allen and asked whether Boeing could build an aircraft twice the size of anything currently flying. Allen said he would look into it. The two men then did something remarkable for an industry built on rigid contracts and careful procurement: they shook hands on a deal that neither of their companies could definitively afford, to build an aircraft that had never existed, to a schedule that seemed impossible.

The Boeing 747, which first flew on February 9, 1969, carried 400 passengers — more than twice any other commercial airliner. It entered service with Pan Am in January 1970 and immediately transformed air travel. By creating an aircraft large enough to spread fixed operating costs over hundreds of passengers, the 747 drove down the cost per seat dramatically. In the decade following its introduction, the average price of a transatlantic air ticket fell by more than 40% in real terms. The 747 didn't just change how people flew. It changed who could fly.

The Biggest Gamble in Corporate History

Boeing bet the company on the 747. The development programme cost $1 billion in 1960s money — more than Boeing's entire net worth at the time. The company borrowed so heavily that its bankers privately wondered whether it could survive if the project failed. The engineering challenges were formidable: no one had ever built an aircraft that large, no existing wind tunnels were big enough to test a full-scale model, and the engine technology required — a high-bypass turbofan producing 43,500 pounds of thrust — had never been built for commercial service.

Boeing built the 747 in a purpose-built factory in Everett, Washington — the largest building by volume ever constructed at the time, at 472 million cubic feet. They hired 50,000 workers, many of them with no aviation experience, and trained them on the job. The 747 was designed in 28 months — a timeframe that would be considered impossible today. On the first rollout, it was 16 months behind schedule.

The Iconic Hump

The 747's distinctive double-deck front section — the "hump" — was originally a practical decision, not an aesthetic one. Boeing's designers assumed the aircraft would quickly be superseded by supersonic transports and the 747 would spend most of its life as a freighter. They therefore put the cockpit on the upper deck to allow freight loading through the nose, using the resulting space to create an upper-deck passenger lounge. When the supersonic transport failed to materialise, the lounge became a defining luxury feature — and the hump became the most recognisable silhouette in commercial aviation.

The 747 also pioneered what would become standard in commercial aviation: the high-bypass turbofan engine. The Pratt & Whitney JT9D that powered the first 747s produced far more thrust from far less fuel than the low-bypass engines it replaced, because most of the air that passed through the engine bypassed the combustion chamber entirely — providing thrust through acceleration rather than burning. The technology, developed under pressure from Boeing's schedule, became the template for every large commercial engine since.

The World It Made

Before the 747, intercontinental air travel was for businessmen and the wealthy. The economics of smaller aircraft meant that fares were high enough to limit the market to those who could justify the cost or absorb it. After the 747, the arithmetic changed. A 400-seat aircraft flying the same route as a 140-seat aircraft, burning roughly the same crew cost and fixed overhead, could offer seats at a fraction of the price. Charter operators, package holidays, and budget long-haul travel became possible. Millions of people made their first intercontinental flight in a 747.

The last Boeing 747 — a 747-8 freighter — was delivered in February 2023, ending a production run of 55 years. Over 1,574 aircraft were built. More people have flown in a 747 than in any other wide-body aircraft in history. The final commercial passenger versions were retired by the major carriers years earlier, but freighter versions still fly daily on long-haul cargo routes worldwide. The aircraft that Juan Trippe and Bill Allen shook hands on in 1965 is still, in modified form, in service today — outliving the airline that ordered it, the man who conceived it, and the era that produced it.

Sources: Clive Irving, Wide-Body: The Triumph of the 747 (1993); Wikipedia, "Boeing 747"; Boeing Company historical archive