The airline rerouted its daily flights between the South Korean capital Seoul and Los Angeles after a North Korean missile launch in July, the report said quoting a spokesperson for Singapore Airlines.
At the latest launch on November 29, flight crews on planes run by airlines such as Korean Air and Cathay Pacific reported sightings of missile activity while in the air.
As a safety precaution in response to North Korea's unpredictable missile launches, Singapore's flagship airline made the very apt decision to change its flight routes that could potentially pass over the test areas.
Korea's flag carrier Korean Air said that although it had not yet taken steps to change flight paths, it is carefully monitoring the situation, stressing that its current flight paths pose "absolutely no danger to passenger safety". They crashed into the sea near Japan.
The organization condemned the Pyongyang regime in October for its repeated launch of ballistic missiles.
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Japan will acquire missiles capable of reaching North Korea.
Minutes later, the pilot of another Korean Air plane reported seeing a similar flash of light, airline spokesman Cho Hyun-mook said, as cited by AP.
Singapore Airlines has changed the travel routes of some of their flights travelling over the troubled Korean peninsula. The French airline expanded its no-fly zone over North Korea as a result.
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.
David C. Wright, a senior scientist at the Union of Concerned Scientists, wrote in a report Tuesday that the Cathay crew most likely had seen the missile's first stage burn out and fall back to earth.