Korean Air and Asiana have both reported a drop in last year "s net profits due to increased fuel costs."

由于燃料成本上升，大韩航空和韩亚航空去年的净利润均有所下降。

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In Korea, investigators from the Fair Trade Commission raided offices of Korean Air and Asiana, the country's two largest airlines.

BBC: NEWS | Business | Air cartel probe expands to Asia

With the latest warning, South Korean air carriers Korean Air and Asiana Airlines have added detours to about 14 daily flights.

CNN: S. Korea reroutes flights, cites 'threat'

Korea has also been wooing mainlanders by granting visas upon arrival at Kimpo Airport, increasing Korean Air and Asiana flights to Seoul and Cheju Island and by assigning 35 travel agencies to cater to Chinese tourists, 210, 000 of whom are anticipated this year.

CNN: ASIANOW - TIME Asia | Travel Watch