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.
US officials told CNN that the re-entry vehicle likely failed during North Korea's most recent missile test, and the crew of a Cathay Pacific flight claims to have seen the missile explode during re-entry, although David Wright, a senior physicist with the Union of Concerned Scientists, suspects that the crew actually saw stage separation and second-stage ignition during the ascent.
But US intelligence sources reportedly said they knew three days in advance and watched the missile preparation.
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". The new flight route goes further north to avoid the Sea of Japan.
North Korean leader Kim Jong Un watches the launch of a Hwasong-12 missile in this undated photo.
Wednesday's missile test reached the highest altitude ever recorded by a North Korean missile and the state-run Korean Central News Agency claims it's capable of reaching the U.S. In response to the test last week, Secretary of State Rex Tillerson called on China to do more to rein in North Korea, specifically through restraining the country's oil supply.
In August, Air France-KLM expanded its no-fly zone around North Korea after a missile test. The sightings are believed to have been of North Korea's latest intercontinental ballistic missile (ICBM) test.
It joins a growing group of airlines who have re-routed planes because of Pyongyang's more frequent launches.