The unidentified man, believed to be in his 20s, had been hiding in the landing gear of an Air Algerie plane before it took off from Oran, Algeria.
Staff at the Paris airport found the man during a technical briefing, reports The Guardian.
According to French authorities, the man was taken to hospital with life-threatening hypothermia.
Commercial aircraft reach an altitude of between 30,000 and 40,000 feet (9,144 and 12,193 meters). The temperature in the landing site usually drops to minus 50 degrees.
The Guardian writes that it is unlikely to survive in the space which is neither heated nor pressurized.
High risk of death
Between 1947 and 2021, there are 132 documented cases of people attempting to travel in the landing pad, according to the US Federal Aviation Administration (FAA).
But the journey is risky.
In April, a dead man was found in the landing gear of a plane in Amsterdam from Toronto, which had previously taken off from Nigeria.
A few months earlier, two dead men were found in the landing gear of an airplane flying between Chile’s capital Santiago and Colombia’s capital Bogotá.
According to the FAA, the fatality rate for people traveling in airplane landing gear is 77 percent.