Boeing has been making the aircraft since the 1960s.

Joe Sutter, the legendary Boeing engineer who led development of the 747 jumbo jet, was known for his bold technical designs, for tough but inspirational leadership, and for a roguish sense of humour that made him a vibrant personality to the end of his days.

Sutter died Tuesday at age 95. His son, Jonathan Sutter, said his father had developed pneumonia but was recovering and was expected to leave the hospital when he died suddenly.

As recently as the first week of August, Sutter had been working on Boeing's behalf: At the family's summer compound on Hood Canal, he hosted a Boeing party for executives of Cathay Pacific who had just taken delivery of a new 747 - the sort of event he'd thrown several times over the years for various airlines.

ANTHONY BOLANTE/REUTERS Joe Sutter, Boeing's chief engineer on the original jumbo, and known as the "father of the 747." in front of a newly unveiled 747-8 jumbo passenger jet in 2011.

In a message to employees Tuesday, Boeing Commercial Airplanes chief executive Ray Conner described him as "one of the giants of aerospace and a beloved member of the Boeing family."

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Conner called Sutter "an inspiration ... not just to those of us at Boeing, but to the entire aerospace industry."

Born into a large Catholic family of eastern European immigrant parents whose family name was changed at Ellis Island, Sutter grew up on Seattle's Beacon Hill neighbourhood overlooking Boeing Field.

He attended Cleveland High School and the University of Washington, where he earned a degree in aeronautical engineering.

ANTHONY BOLANTE/REUTERS A VIP-configured Boeing 747-8 jetliner rolls out for takeoff from Paine Field in Everett, Washington.

On leaving the Navy after World War II, Sutter returned to Seattle in 1946 and soon accepted a job offer from Douglas Aircraft in California. Luckily for Boeing, his wife Nancy had just given birth to their first child, and so he deferred that move and accepted a "temporary" job with the local planemaker.

There, Sutter fell under the spell of inspiring engineers such as George Schairer, who were leading Boeing toward its pioneering development of jet airplanes. He never left.

Sutter worked on Boeing's first jet aircraft, the 707, riding along on early demonstration flights with airline officials.

SEAN GALLUP / GETTY Ed Force One, the Boeing 747 passenger plane of British heavy metal rockers Iron Maiden, takes off.

Later he led the technical staff on Boeing's first short-haul jet, the 727. During development of the 737, Sutter earned a patent for the way the engines were placed tightly under the wings.

In 1965, Sutter began a study of a new long-distance jet, the 747, with which his name will forever be closely linked.

In his book, "747," he wrote of that jet program: "More than just the high point of my career, it was what I had dreamed of since I was a boy."

JASON REDMOND/REUTERS A Boeing 747 Dreamlifter, used to fly large 787 components from suppliers to Boeing factories, is pictured in Everett, Washington.

Built to an unprecedented size, the initial model would carry 2 { times as many passengers as the 707.

He and his engineers initially played second fiddle to the more glamorous Boeing development project at the time, the Supersonic Transport (SST).

But the US government ultimately killed funding for the SST, and the 747 turned into the icon of international long-haul flying that established Boeing's supremacy in commercial aviation for more than two decades after it entered service in January 1970.

Sutter's team became known as "The Incredibles" for producing what was then the world's largest airplane in record time - 29 months from conception to rollout. Conner noted that this "remains a staggering achievement and a testament to Joe's incredible determination."

As a leader, he was known for his strong-willed pugnacity.

His son, who worked at Boeing for 20 years while his father was there, recalls his fierce reputation at work for standing firm for what he thought was the right thing to do.

"Dad would listen to everybody and then he would make a decision - and that's the way it was going to be," Jonathan said.

In 1986, at 65, Sutter was appointed by President Ronald Reagan to serve on the high-level committee investigating the explosion of the Space Shuttle Challenger.

Appalled that NASA's safety standards were lower than those in his commercial airplane world, Sutter was typically vocal in his criticism and pushed a key recommendation of the committee to implement a new safety management system.

As recently as June, Sutter was visiting his office at Boeing Commercial Airplanes headquarters in Longacres once a week. Answering emails and taking calls, he was still an able promoter of the giant airplane he created.

In May, the president of Russian air-cargo company Volga-Dnepr, Alexey Isaikin, visiting Boeing in Seattle during sales negotiations specifically requested dinner with Sutter-a pilgrimage that surely helped seal the Volga-Dnepr 747 deal announced at the Farnborough Air Show in July.

Sutter's wife Nancy died in 1998. He is survived by his son Jonathan Sutter of West Seattle, and his daughters Gabrielle Young of Arlington and Adrienne Craig of West Seattle; four grandchildren, Alisa, Jonathan, Koa and Tatiana; and three great-grandchildren, Sarah, Joseph and Mose.