Since July, Singapore Airlines has altered the route of its daily flights between the South Korean capital of Seoul and Los Angeles because of North Korean missile tests. It hadn't previously announced the changes before this week.
The crew of the Cathay Pacific Airways flight says they witnessed the rogue nation's latest weapon break apart and explode as it traveled through the sky early Wednesday morning on November 29.
In the early hours of Wednesday, North Korea test-fired what is believed to be its most technologically advanced long-range ballistic missile.
"A Korean Air jet flying to Incheon from San Francisco reported to Japanese controllers that its flight crew saw a flash from what was believed to be the North Korean missile", a Korean Air spokesman said. Pyongyang said the projectile flew as high as 4,475 kilometers (2,800 miles) before plummeting down into waters off the western coast of Japan.
Marco Langbroek, a space expert who tracks North Korea's missile program, told CNN he noticed something unusual about the stars in images taken from opposite sides of the missile launch. Korean Air hasn't specified how close its flight was to the missile.
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The missile was far from the plane, and operation was unaffected, Cathay said, adding that it had informed other carriers and relevant authorities.
North Korean leader Kim Jong Un watches the launch of a Hwasong-12 missile in this undated photo.
Guidelines issued by the International Civil Aviation Organization, a U.N. agency tasked with governing air safety, state that nations have the "responsibility to issue risk advisories regarding any threats to the safety of civilian aircraft operating in their airspace". However, South Korea says that the North Korean government regularly fails to issue these notices when conducting missile launches.
Travelers who are concerned should know the chances of an airplane colliding with a missile are extremely low: One safety analyst estimates that it is less than a billion to one.