As the nuclear power plant crisis affecting Japan unfolds, Cathay Pacific is seeking clarification of international guidelines in the event that radioactive material and toxic chemicals enter the airspace.
A person close to the airline said it was also working out how it would deal with radiation-affected passengers, including the possibility of removing potentially contaminated seats.
Cathay Pacific chief executive Tony Tyler said the airline would maintain services to Japan at their current level of eight flights a day.
The special one-way fare would remain at HK$5,755 until March 27, a spokesman said.
Most airlines had arranged for flight crews flying to Japan to stop overnight at nearby cities in light of the nuclear crisis.
Only Lufthansa and Alitalia believe the current situation warrants the suspension of flights to Tokyo's two airports.
The person close to Cathay said the company was monitoring the situation with the civil aviation authorities in Hong Kong and Japan, and would refer to international practices - including those issued by the Association of European Airlines and International Civil Aviation Organisation - if the suspension of services became necessary.