It hadn't previously announced the changes before this week.
Singapore Airlines has changed some of its flight routes between Asia and the U.S.in response to North Korea's missile tests, CNNMoney reported.
Singapore Airlines changed the route of its Seoul-Los Angeles flights in July due to concerns over North Korean missiles, Singapore's Channel NewsAsia reported Tuesday.
The news comes after crew from two other Asian airlines-Cathay Pacific and Korean Air-reported seeing what they believed was a ballistic missile while they were in the sky on November 29.
ICAO has condemned North Korea for launching missiles without notice, a move that could represent a threat to commercial flights.
The missile was far from the plane, and the plane's operation was unaffected, Cathay said, adding it had informed other carriers and relevant authorities.
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"Currently, our flight routings do not transverse in the vicinity of the missile trajectory as we have taken earlier steps to avoid the northern part of the Sea of Japan", the airline told Business Insider in a statement.
An IATA spokeswoman said by email on Thursday that de Juniac's remarks were in reference to the airline trade group's support of a recent decision by ICAO to "strongly condemn North Korea's continued launching of ballistic missiles over and near worldwide air routes".
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.
European airlines Lufthansa and Air France-KLM shifted their paths in August after two North Korean test launches in July.
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.