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Right now, as you're watching this video, there are likely over 9700 commercial airplanes flying around across the world carrying over 1.2 million people throughout the skies.

That's basically the entire population of Estonia, and that is just the average amount at any given time.

On some very busy days during the high season in June, over 200 1000 flights will take place across the world over a 24 hour period.

And despite all of that metal flying through the sky in every direction all the time, collisions almost never happened.

There's always a very choreographed dance happening above you, up in the skies around the world, 24 hours a day, with tens of thousands of moving parts and people who plan it all out.

And while the system is nearly perfect in keeping everything safe, it's still not 100% perfect.

All of the time accidents do happen, and the incident that I'm about to tell you about had the potential to become the worst accident in the entire history of the aviation industry, had a few things gone slightly differently.

On January 31st, 2000 and one, Japan Airlines had two flights whose destinies were soon to be horrifyingly intertwined.

J A L Flight 958 a McDonnell Douglas D C.

10 40 was flying from Bustan, South Korea, to Tokyo Narita.

She had 237 passengers and 13 crew on board, while J.

A L Flight 907 had just taken off from Tokyo Haneda towards Okinawa.

Flight 907 was a Boeing 7 47 that was carrying 411 passengers and 16 crew on board.

The two planes had an intersecting flight path over the Japanese island of Han Shu, but they were supposed to pass each other by a completely safe distance of 2000 ft in elevation difference.

Unfortunately, that's not exactly what happened, though.

Just 20 minutes after Flight 907 had taken off, the flight attendants began serving drinks in the Plains traffic avoidance collision system began sounding an alarm inside of the cockpit.

The plane had just reached its cruising altitude of 39,000 ft, while Flight 958 was approaching the intersection point at a lower 37,000 ft.

Every commercial plane is equipped with a traffic collision avoidance system, or T, casts that monitors nearby airspace and warns pilots of a potential threat all independently from air traffic control.

The pilots on board both planes received normal instructions from their T casts, but Flight 907 was receiving conflicting instructions from air traffic control in Tokyo.

The controller on duty for the area that both planes were flying through was a brand new 26 year old trainee named Hideki Hachi Tani, who was probably overloaded with 12 different flights to manage all.

At the same time, he intended to instruct Flight 958 cruising at 37,000 ft to descend further to increase the intersection distance.

But instead he accidentally told Flight 907 to descend.

The pilot on the plane chose to listen to air traffic control over his planes, integrated T casts and therefore descended an altitude which put his plane onto a direct collision course with Flight 95 eight when Hotch Itani noticed that Flight 958 have remained at a steady altitude and was heading towards disaster.

He ordered the pilot to turn right to get off the collision course.

But for some reason, that message never reached the pilot.

Kakutani supervisor was a woman named Yasuko Money, and while she did eventually notice her trainees error, she also managed to make things even worse.

She meant to instruct Flight 907 to climb in altitude to avoid a crash.

But for some reason she accidentally said Flight 957 to climb.

And since there wasn't a Flight 957 operation that day, nobody listened to it.

And both planes remained on their dangerous collision course.

And once the two planes were within visual proximity of one another, the pilots of both realized that something very bad had happened.

Indeed, they literally only had seconds to formulate a plan and avoid a collision, and the consequences for failure would be absolute.

Were they to crash, it would become the deadliest accident in all of aviation history.

Everybody on board both planes would probably die.

A total of 677 people's lives were at stake, and their fate would be decided by two men at the controls of the Plains, using a last second evasive maneuver.

The pilot of Flight 907 a 7 47 mind you jerked the plane down and within two seconds flew directly beneath Flight 958 Now there are conflicting sources about exactly how close the plane's got to each other.

The pilot of Flight 907 claimed during a later interview that the two planes came a mere 10 m away from obliterating each other, while data recovered by investigators on the two flights.

T cast systems revealed that the planes came or like 135 m away from hitting each other.

But regardless of the answer, they came terrifyingly close.

When Flight 907 performed its last second evasive maneuver, several things happened inside of the cabin.

Passengers and flight attendants who weren't buckled in flew up and smashed their bodies into the ceiling before falling back down.

Drink carts were flung around the cabin, which hit people and spilled boiling water.

One young boy, who wasn't buckled in was even thrown across four rows of seats, and another woman broke her leg.

In total, seven passengers and two crew members received serious injuries the required medical attention, while 81 Mawr passengers and 10 crew members sustained minor injuries mounting to bruises or scalded skin from boiling water.

Nobody aboard Flight 958 was injured at all, which continued on its way to Tokyo.

Normally, Flight 907 meanwhile, canceled their trip to Okinawa and immediately returned back to Tokyo, where medical crews were waiting to treat the injured.

30 passengers were sent to the hospital afterwards, but everybody recovered and nobody died during a disaster that could have been much, much worse.

Years later, the A T C trainee on duty that day was sentenced toe one year in prison while his supervisor was sentenced to one year and six months for their roles in the incident.

The ultimate lesson from the story is that while humans can design nearly perfect systems of transportation, humans themselves aren't perfect and multiple mistakes made by us can occasionally lead to a nightmare.

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