Story highlights North Korea test-fired its Hwasong-15 missile Wednesday

"We remain alert and review the situation as it evolves," Cathay Pacific said

Hong Kong (CNN) The crew of a Cathay Pacific flight from San Francisco to Hong Kong saw what they believed was a North Korean ballistic missile re-entering the Earth's atmosphere last Wednesday, the airline said Monday.

Cathay said in a statement that it had been in contact with relevant authorities, industry bodies and other airlines about what was seen from Cathay Pacific flight 893, and at the moment there were no plans to change flight routes.

"Though the flight was far from the event location, the crew advised Japan ATC (Air Traffic Control) according to procedures. Operation remained normal and was not affected," the statement said.

"We remain alert and review the situation as it evolves."

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