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Say “happy birthday” to the Boeing’s 737. Boeing's maiden flight on the first prototype of the aircraft came on April 9, 1967.

Brien Wygle, the pilot at the helm of that first flight, was at anniversary festivities Sunday at the Museum of Flight in Seattle.

“Fifty years ago we had no idea,” Wygle, now 92, said in an interview with The Seattle Times ahead of the celebration. “We were hoping to eventually sell enough to break even.”

The 737, of course, would go on to become the best-selling commercial passenger plane of all time. Boeing has already delivered more than 9,400 of its 737s to customers during a remarkable five-decade run for the aircraft.

THE SEATTLE TIMESBoeing 737, which ‘took the aviation world by storm,’ marks 50 years of flight

The jet appears likely to remain in production for the foreseeable future. Boeing is thought to be just weeks away from delivering its first 737 “MAX,” its latest variant of the jet that features a number of technological and performance improvements.

The Museum of Flight feted the 737 anniversary Sunday, rolling out the original 737 prototype. Boeing also brought in one of its new MAX variants for the occasion.

As for the original, the Times notes it “was used as a Boeing test aircraft until 1973, then sold to NASA for use as a flying research laboratory.” NASA eventually donated the plane to the museum in 1997, where it is now on display after a detailed restoration.

Check out the photo gallery above to check out Boeing 737 photos, both from Sunday’s ceremony in Seattle and of 737s currently flying for airlines around the world. The pictures, from Today in in the Sky contributor, show at least one photo of all the major 737 types, ranging from the “-100” to the MAX 9.

Enjoy!

TODAY IN THE SKYBoeing rolls out first 737 MAX 9

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IN PICTURES: Boeing's new 737 MAX makes its maiden flight

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IN PICTURES: Boeing rolls out first 737 MAX

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IN PICTURES: A photo tour of Boeing's 737 MAX assembly line

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