The Boeing 747 jumbo jet is going away. America’s last two 747 operators, Delta and United, are phasing out their jumbo fleet.

United, however, is giving fliers one last chance to experience the queen of the skies in the US before her retirement.

On Friday, United will operate Flight 2704 from Chicago O’Hare International Airport to San Francisco International Airport using one of its dozen or so remaining 747-400 jets. The flight is scheduled to take off from Chicago at 6:30 p.m. CT before landing in San Francisco at 8:51 p.m. PT.

Normally, the fleet is used exclusively on flights to Asia and Europe.

In an interview with Business Insider earlier this year, United CEO Oscar Munoz cited issues concerning the long-term maintenance of the 747 as a driving force behind the retirement of the aging aircraft.

United's new fleet of twin-engine Boeing 777-300ER airliners will take over many of the 747's routes. As for Delta, the new Airbus A350-900 is expected to replace the 747-400s it inherited through its 2008 merger with Northwest Airlines.

As the Boeing 747's time winds down, here's a look at the glorious past of the jumbo jet:


The Boeing 747 first flew in February 1969.

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The big jet and the Everett, Washington, factory in which it was built were designed and constructed in just 16 months by a team of 50,000 Boeing employees.

Foto: source AP

This group of people became known as the "Incredibles."

Foto: source AP

The 747 was a major gamble for Boeing. The prevailing thinking at the time was that the world was heading toward supersonic travel.

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Boeing bet that people wanted to travel in comfort for less money.

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As the legend goes, Pan Am boss Juan Trippe told Boeing that he needed a plane twice the size of ...

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... the Boeing 707 the airline operated at the time.

Foto: source Flickr/Barry Lewis

To give Pan Am the capacity it was looking for, Boeing added a second aisle to the cabin — thus creating the wide-body jet.

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According to Boeing, the 747 could carry 3,400 pieces of luggage and be unloaded in just seven minutes.

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With seating for as many as 550 passengers, the 747 truly dwarfs the 707 as well as other workhorse jets of the era, such as ...

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... the Douglas DC-8 and ...

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... the de Havilland Comet.

Foto: source Wikimedia Commons

When it entered service in 1970 with Pan Am, the public was mesmerized by the mighty jumbo jet.

Foto: source AP

In the 1970s, Boeing was joined by a duo of smaller three-engine wide-body jets: the Lockheed L-1011 and ...

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... the McDonnell Douglas DC-10.

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Boeing followed up the original 747-100 with ...

Foto: source Flickr/Aero Icarus

... a new variant in late 1971 with more powerful engines and greater range called the 747-200 series.

Foto: source Flickr/Aero Icarus

A decade later, Boeing updated the 747 again with newer engines and an enlarged second deck. This version was called the "-300."

Foto: source Flickr/Aero Icarus

The -300 didn't prove to be as popular as Boeing would have liked. So in 1989, Boeing launched the -400. It featured modern avionics, a fully glass cockpit and greater range. It would go on to be the most popular of the 747 variants.

Foto: source Flickr/Aero Icarus

In 2011, Boeing launched the latest version of the jumbo jet, called the 747-8. At 250 feet, it's the longest airliner ever built.

Foto: source Boeing

Over the years, the 747 has been deployed in a variety of ways, ranging from firefighting water tanker ...

Foto: source REUTERS/Johannes Eisele

... and space shuttle carrier ...

Foto: source REUTERS/Ho New

to freighter ...

Foto: source REUTERS/Johannes Eisele

... and the official presidential aircraft of China, ...

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... Japan, and ...

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... the US.

Foto: source REUTERS/Soe Zeya Tun

But the 747 really became a cultural icon when it was the plane to have for the world's major airlines. For many years, it seemed as if you weren't playing in the big leagues unless you were flying the jumbo.

Foto: source REUTERS/Toby Melville

In addition to Pan Am, everybody else had them as well.

Foto: source Flickr/Aero Icarus

Qantas.

Foto: source REUTERS/Jayanta Shaw

Air France.

Foto: source REUTERS/Franck Prevel

Thai.

Foto: source REUTERS

Philippines.

Foto: source REUTERS/Romeo Ranoco

Singapore.

Foto: source REUTERS

Air China.

Foto: source REUTERS/China Daily

South African Airways.

Foto: source REUTERS/Ian Waldie

Northwest.

Foto: source Flickr/Aero Icarus

Braniff International.

Foto: source Flickr/Aero Icarus

Delta.

Foto: source REUTERS/Shannon Stapleton

Lufthansa.

Foto: source Boeing

Air India.

Foto: source Flickr/Aero Icarus

KLM.

Foto: source Flickr/Ikarasawa

Cathay Pacific.

Foto: source REUTERS

Korean Air.

Foto: source Flickr/Aero Icarus

United.

Foto: source United Airlines

British Airways.

Foto: source Flickr/Aero Icarus

Japan Airlines.

Foto: source Flickr/Ikarasawa

Air New Zealand.

Foto: source Flickr/Aero Icarus

Virgin Atlantic. (And these are just some of the airlines that flew the jumbo jet.)

Foto: source Flickr/Aero Icarus

Over the years, Boeing has sold more than 1,500 747s.

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The venerable Boeing jumbo jet has outlasted the supersonic Concorde, as well as ...

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... the DC-10 and ...

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... its replacement, the McDonnell Douglas MD-11.

Foto: source Flickr/Rob Schleiffert

Not to mention Lockheed's L-1011, which went out of production after selling just 250 planes.

Foto: source Flickr/contri

The Airbus A340 ended production in 2011 after selling less than 400 jets.

Foto: source REUTERS

Unfortunately, it looks unlikely that the jumbo jet will survive its latest slew of challengers, which include Airbus' double-deck A380 superjumbo and ...

Foto: source Gene Blevins/Reuters

... the A350XWB twin-engine "mini-jumbo."

Foto: source Airbus

The 747 has also lost sales to its corporate siblings, the 777 mini-jumbo and ...

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... the 787 Dreamliner.

Foto: source Wikimedia Commons

To compensate, Boeing has slowed down production of the 747 to just one aircraft every two months in an attempt to buy the sales team more time to generate orders.

Foto: source REUTERS

Even though sales of the new jumbo are slow, with proper maintenance the "Queen of the Skies" can be with us for decades. We're just at the beginning of the end of the jumbo era, no matter what Boeing decides to do about its most famous plane.

Foto: source REUTERS/Larry Chan