“Oh, my God! . . . The entire building has collapsed.”

Journalist Don Dahler is a military brat, familiar with the sound of planes. 

So when he heard the roar and then the crash, his first thought was, I think that was a missile.

The reports began almost immediately: a small plane had hit the north tower of the World Trade Center.

Dahler knew that what he’d heard was not a small plane. 

His journalistic instincts kicked in, and he grabbed his phone, dashed out to his fire escape - which gave him a clear view of the Twin Towers - and called into ABC’s Good Morning America. Dahler, at the time, was a correspondent for ABC. 

For the next several minutes, he described the scene unfolding before him: more and more fire and smoke, and his assertion that the hole in the north tower was too big for it to have been made by a small commuter plane.

At 9:03 a.m., with Charles Gibson and Diane Sawyer commenting on the pictures they were seeing, and stressing that they were reporting speculation and that they knew little at the moment, Don Dahler said: 

“Well, we’re seeing - it appears that the - there is more and more fire and smoke enveloping the very top of the building, and as fire crews descending on this area, it — it does not appear that there’s any kind of an effort up there yet. Now remember - oh, my God!” 

Don Dahler had just seen United Flight 175 hit the south tower of the World Trade Center. 

Not only did he viscerally react, the studio crew cried out in astonishment and Diane Sawyer gasped, “My God!” under her breath. 

It was the moment Don Dahler and everyone else knew that this was not an accident, that it was a deliberate attack. Dahler could not see the plane hit the building from where he stood but he could see the explosion. 

From then on, Dahler kept his eyes and ears on the Twin Towers, as best he could. 

At 9:58 a.m., Peter Jennings looked at the screen and said, “We now have - what do we have?  We don’t . . . now, it may be that something fell off the building.  It may be that something has fallen, but we don’t know, to be perfectly honest.”

Then Jennings said that “Stan Dahler” was “down in the general vicinity” and asked, “Dan, can you tell us what happened?” (To be fair, Peter Jennings was trying to sort through information coming fast and furious and trying to keep his composure while doing it.)

Then came the following exchange:  

Dahler:  “Yes, Peter, it’s Don Dahler down here, I’m four blocks north of the World Trade Center.  The second building that was hit by the plane has just completely collapsed. The entire building has just collapsed, as if a demolition team set off — when you see the old demolitions of these old buildings. 

Unknown speaker: “My God.”

Dahler:  “It came down on itself and it is not there anymore.”

Jennings: “Thanks very much, Dan.”

Dahler: “— completely collapsed.”

Jennings: “The whole side has collapsed?”

Dahler: “The whole building has collapsed.”

Jennings: “The whole building has collapsed?”

Dahler: “The building has collapsed.”

Jennings: “That’s the southern tower you’re talking about.”

Dahler: “Exactly. The second building that we witnessed the airplane enter has been — the top half had been fully involved in flame.  It just collapsed. There is panic on the streets, thousands of people running up Church Street, which is what I’m looking out on, trying to get away.  But the entire — at least as far as I can see, the top half of the building, at least half of it, I can’t see below that — half of it just started with a gigantic rumble, folded in on itself, and collapsed in a huge plume of smoke and dust.”

When the tape was re-racked and Jennings took a look at the building falling, all he could say in reaction was a quiet, “My God.”

I don’t know if there is anything else that someone could say in the face of a 110-story building crumbling to the ground, not because of an accident, but because someone deliberately wanted to do it. 

What do you say when you’re on the air and it’s your job to report the news as you see it and understand it? 

I give both Don Dahler and Peter Jennings kudos for not totally “losing it” on the air; knowing that they had to stay professional and calm, that the country would be taking their cue of how to react from the people they saw on the air. 

In an interview CBS News did with Dahler (then a reporter for CBS) on the 10th anniversary of 9/11, he said that for the next two weeks, he didn’t leave the area, fearing that the police wouldn’t let him back in. 

He remembers the faces and voices of the rescuers, those who dove in head first, the ones who ran upstairs when everyone else was running downstairs. 

He also remembers the faces and voices of people looking for loved ones, the expressions on their faces and in their eyes begging, please, tell me you saw this person alive. Please tell me they’re okay. 

Don Dahler could never answer “yes” to that last question. 

And it’s why he can’t forget it. 

In addition to being a reporter, Dahler has written three novels and a biography, Fearless, about Harriet Quimby, the first American woman to earn a pilot’s license. 

Today, many like myself will take a peek at 9/11 coverage. They may remember all the events and the times they happened: the North Tower hit at 8:46 a.m., the South Tower hit at 9:03 a.m.; the Pentagon hit at 9:37 a.m.; the South Tower collapsing at 9:59 a.m.; the North Tower collapsing at 10:28 a.m. 

Those who lost loved ones will stop and remember.

And those who saw and heard those images and showed us will remember. 

Including Don Dahler, who thought he heard a missile, looked outside . . . and probably reflected the feelings of millions of viewers with his exclamation of, “Oh, my God!” and then repeating, “The whole building has collapsed” to an incredulous world.

Just my .04, adjusted for inflation.