(CNN) — On November 26, 2003, supersonic airplane Concorde made its last flight, returning to the airfield near Bristol, in southwest England, where it's remained since.

As this marvel of modern engineering soared over the Clifton Suspension Bridge in Bristol, a landmark of Victorian engineering based on a design by Isambard Kingdom Brunel, it created a poignant moment witnessed by cheering crowds.

High in the sky, dangling out of a helicopter and buffeted by icy winds, photographer Lewis Whyld managed to capture it on camera -- an image that has become the defining shot of the golden age of faster-than-the-speed-of-sound travel

Whyld, who now works as an aerial cameraman for CNN, reveals how he took one of the coolest airplane photos ever taken.

The photographer's story

I remember somebody shouting: "There it is, there's the aircraft!" I was so excited just to see it, I took a picture straight away, and then thought, "hold on, I've got to wait until it's over the bridge."

We were, I think, at about 3,000 feet, with Concorde 1,500 feet below us. I was standing on the skid outside the helicopter, freezing cold, with downdraft from the rotors blowing on me. I couldn't feel my fingers, couldn't feel my toes, couldn't feel my face.

It wasn't an easy shot. I had to lean right out of the helicopter because of the angle we were flying at. I was terrified. Terrified of the newness of being in a helicopter for only the second time in my life, terrified of messing the job up.

I'd only recently been hired by an agency called South West News Service, which supplies images and reports from the southwest of England to national UK and international media. When the Concorde job came up, I simply put my name down for it.

The only thing my boss really said to me was just, "don't f*** this up."

3,000 feet in the air

Lewis Whyld in 2003, the year he photographed the Concorde. This photograph was taken on his first-ever attempt at aerial photography. He was in a plane with his friend, who was training to fly at the time. Courtesy Lewis Whyld

Because we were in a helicopter, there was a lot to go wrong. Trying to line everything up in three-dimensional space was a challenge. The chances of the plane flying over the bridge at exactly the angle we needed were small.

And, of course, the plane is moving very fast.

Whereas today, you can fire your camera in a burst and get a selection of images, back then they were much slower. I only had one shot.

The plane was so white in the bright sunlight, against a dark background of foliage and the river, the contrast was huge. It would've been easy to overexpose Concorde and just be left with a white triangle with no detail.

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Because the plane was traveling so quickly and my focus point was so small, it would've also been very easy to focus on something on the ground, leaving the Concorde a blurry mess.

And the helicopter was constantly moving. The pilot couldn't hover, we had to fly in circuits -- something to do with keeping the helicopter in the air.

Trying to balance those things out, you stop the aperture down so that you have more depth of field, but that lowers your shutter speed, which means you could get blur if you move the camera too quickly. There was a lot of mental arithmetic and I probably changed my camera's settings 10 times before Concorde arrived

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Capturing the moment

l e v a r t

There was no trial and error. When it flew by, I would get one chance to take the picture.

And then it was there, banking in the sky beneath me.

I was standing on the helicopter's skid and leaning out, pulling against the harness, over thin air and shooting the picture, just as it passed the bridge.

I didn't realize the photograph would make that shape it does -- with the cliff face, the bridge and the crowd all kind of framing the aircraft, against a relatively clean background and almost mirroring the shape of the wing.

Everyone loved Concorde, so having that human element in there meant that the picture was elevated a bit more than if it was just empty scenery behind.

Brunel's Suspension Bridge also helped -- the engineering triumphs of the 19th and 20th centuries together.

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After the fly-by, we landed at Filton airfield, where Concorde had also landed. I took other photos of it being towed into its hangar with the pilot waving from the window.

Then I started to edit my images to send them back to the office.

I remember people looking over my shoulder when I brought the bridge picture up on my laptop. I really didn't know what I had, right then. I didn't know that it was a special picture and people would really love it. I was just thinking, "job done."

Then people started crowding behind me. Other photographers said: "Well, what's the point in us sending anything, because that's the one that everyone's going to use."

I had no idea at the time that that would turn out to be true. It did run in all the newspapers -- of course they used other shots too -- but that was certainly the main one.

Some produced it as a collector's poster. I got my mum to collect the tokens needed to send off for them. Some of the newspapers sent me bottles of champagne. I'd never known anything like it.

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Enduring image

The image certainly made an impression with aviation fans.

I've been contacted by a few groups asking if I can help get Concorde flying again. Ironically, I thought it would be better for my photo if it didn't ever take off again, as that would no longer be the last flight.

But it is an incredible machine. I didn't ever get the chance to fly on it and, in fact, I've never actually been on it. I've only seen it from the outside, beneath me. That was the first and the last time that I saw it flying.

In the 15 years since 2003, I've taken other memorable pictures, but you're always remembered for your greatest hits and I guess that will always be -- in inverted commas -- one of my "greatest hits."

Part of that is because of the picture and part of it is because there was no other chance to do it. So no matter how good the picture is, it would always be the last picture of Concorde. I was lucky that it happened to be a good one.

I'm quite known for doing drone footage now. So, this was my first aerial picture and from then I've coincidentally made a bit of a career niche out of a doing aerial pictures and using drones.

Even with advances in technology, if we went back and did that Concorde shot again we'd have to use a helicopter. A drone wouldn't be permitted to hover over the airplane and take pictures.

So we would still do it the same way, but we'd have better cameras and I would come back with a burst of pictures that we could choose from, rather than just one.

But in some ways, I am quite glad the technology was as it was -- because there is just one photo. We're a bit spoiled now and having more than one version of an image can water down its power.

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Changing technology

Concorde Alpha Foxtrot, the aircraft photographed by Whyld, is now on display at Aerospace Bristol. Suzanne Plunkett/CNN

Interestingly, although camera technology has moved on, aircraft technology in a lot of ways hasn't. Back then you could get to New York in three and a half hours. Sure, we have bigger aircraft -- the A380 for example -- but in terms of raw speed, Concorde's still the pinnacle of aviation.

If I were to take the photo today, I would have also much higher resolution camera, so I would be able to take a wider picture that we could then crop to different compositions. At the time I used a relatively long lens and it's really the full frame that you see, that is the best way to get the highest resolution possible out of the picture.

Now we could afford to use a wider lens and still get a high-resolution picture if we needed to zoom in afterwards, but at that time we didn't have that.

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There are postcards of my photograph and posters -- there's even a cross-stitch. I've been approached to do a limited-edition print run.

With modern technology, in terms of editing, we can certainly make a better print of it than ever before. So that might be some way to revisit it and modernize it slightly, because it's been 15 years. We can't change the camera it was taken on, but we can change the way that we edit it and the details that we draw out.

I still have the digital negatives, so we can we can always go back to the raw file and take it into the digital darkroom -- and then run it through the incredible modern technology that we've got today to extract details that we couldn't previously.

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Incredible opportunity

Lewis Whyld in 2017, photographing in the Arctic for a CNN project highlighting the impact of global warming. Courtesy Lewis Whyld

Looking back, I was surprised actually, that the final flight of Concorde would be this small hop from London to Bristol, but it was a chance for our photo agency to punch above our weight, to compete with international photojournalists from New York and London.

It was a fantastic chance to take a great image on a story that wasn't really political, wasn't terrible, wasn't a disaster or anything like that.

In a way, I'm pleased that one of my enduring images is of something that's celebratory, rather than depressing or a disaster, like all the hurricanes and typhoons I've been to, all the war zones and riots.

In the years since the final flight, I moved on from Bristol to London. I worked for the UK's Press Association and The Telegraph newspaper before eventually moving to CNN to shoot aerial footage and videos and drone footage.

The Concorde shot was always the springboard for my career. It's where it kind of all started. After that people knew my pictures and offered me jobs. It oiled the wheels, moving my career forward.