Cathay Pacific said its plane was "far from the event location" on Wednesday, but it did not say how far.
In a message to staff, Cathay Pacific's General Manager of Operations Mark Hoey relayed what crew members had reported seeing of the suspected missile.
A plane takes off near the control tower at San Francisco International Airport on February 25, 2013 in San Francisco, Calif.
North Korea's missile testing, which is often conducted without prior notice as required under global agreements, has caused some concern for commercial airlines.
The pilots of two Korean Air flights reported flashes of light in North Korea at the time of last Tuesday's test of the new Hwasong-15 intercontinental ballistic missile, a weapon that could theoretically range all of the continental U.S. Cathay Pacific flight CX893 claimed to have seen the weapon explode and break apart, according to the South China Morning Post.
"It is something to be concerned about", said Peter Harbison, executive chairman of CAPA - Center for Aviation, a consultancy in Sydney, Australia.
The operators insist the missile flew far from the flight's path and at no point posed a threat to the aircraft.
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Cathay Pacific also ensured they have been contact with relevant authorities, industry bodies and other airlines about the incident.
"At the moment, no one is changing any routes or operating parameters", the airline said in a statement to The Associated Press.
But North Korea's tendency to launch without warning is "worrying", he added.
He said that the Security Bureau and Civil Aviation Department should establish a panel to work with officials with South Korea, Japan and Russian Federation, for better intelligence sharing over related military movements, the Morning Post wrote.
Flight trackers place the plane near Japan when the missile was launched on November 29.
In response to the launch, President Trump said the United States will "take care of it".
If the missiles are expected to strike Japan, land- and ship-based interceptors are ordered to shoot them down. Last month, the F.A.A. restricted American carriers from that slice of North Korean airspace as well, citing the "hazardous situation created by North Korean military capabilities and activities, including unannounced North Korean missile launches and air defense weapons systems".