South Korea's major carrier Korean Air Lines Co. said Tuesday that it is reviewing the further suspension of its flights to Japan as the number of visitors to Japan has dropped significantly due to thorny ties between the two countries.

The company said in a statement that Busan-Osaka will be halted from Sept. 16, while Incheon-Komatsu and Incheon-Kagoshima routes will be suspended from Sept. 29 to Nov. 16. and Incheon-Asahikawa from Sept. 29 to Oct. 26.

(A Korean Air Boeing 777 passenger jet)[Getty/Kyodo]

Ties between South Korea and Japan have sunk to their lowest level in years following Japan's recent tightening of export rules to South Korea, which Seoul views as a retaliation of court rulings that ordered Japanese firms to compensate groups of South Koreans over the issue of wartime labor.