Described by Pyongyang as its "most powerful" missile, the 29 November launch ended up in Japanese waters but flew higher than any other the North had previously tested.
Channel NewsAsia found out that Singapore Airlines (SIA) has taken steps to reroute its Seoul-Los Angeles flights since July this year, following Pyongyang's July 27 missile launch into the Sea of Japan.
Singapore Airlines changed a flight route between South Korea and the USA earlier this year over fears about North Korean missile launches in the Asia-Pacific region, it has emerged.
However, according to the scientist, the North Koreans for that.to increase the range of missiles, could charge it with the simulation bomb, which had a small weight.
The Hong Kong based airline sent out a staff note earlier this week sharing the communications from the cockpit, with the crew saying "we witnessed the DPRK missile blow up and fall apart near our current location". The new route avoided the northern part of the Sea of Japan, the spokesperson said.
The test-launch raised tension further with South Korea and the U.S., who on Monday began their largest ever joint air exercise, which the North has branded an "all-out provocation".
The crew of Cathay Pacific CX893, which was traveling to Hong Kong from San Francisco, reportedly saw the missile from their plane as it was passing over Japan and alerted the country's air traffic control.
Countries are required to give warnings about their upcoming missile tests as per worldwide agreements.
The North Korean missile was sacked very high up, reaching an altitude of 4,475 kilometers (2,780 miles) before falling back into the Sea of Japan about 950 kilometers (600 miles) from where it was launched. The chances are "billions to one", aviation safety analyst David Soucie told CNN.