Korea's Thanksgiving holiday of Chuseok is shorter than usual this year, but the nation's international airports are still expected to be overcrowded.

According to the airline industry on Sunday, reservation rates for overseas travel for Sept. 9-14 reached as high as 90 percent.

The industry analyzed that the number of overseas travelers during the period jumped because many office workers saved their summer vacation days this year to make up for the truncated Chuseok holiday, which falls on Sept. 11-13, earlier than usual.

Korean Air filled up 93 percent of its seats on flights to East Asian nations and 90 percent on flights bound for China, brining the overall rate for international flights to about 89 percent.

Meanwhile, Asiana Airlines has more than 90 percent of its seats booked for flights to top vacation destinations such as Phuket, Bangkok, Singapore and Saipan thanks to the rise in family trips over this period.

Jeju Air, one of the cheapest airlines in Korea, also recorded high rates of 92 percent to 95 percent for routes to Japan, Hong Kong and Bangkok, while Manila was lower at 80 percent.

Eastar Jet also said that its reservation rate is rising as Chuseok approaches, but it still has seats available. It has filled 87 percent of seats on its Tokyo-bound flights, 80 percent for Sapporo, Hokkaido and 85 percent for Kota Kinabalu in Borneo, Malaysia.