WASHINGTON, Aug 25 (Reuters) - Korean Air is

expected to announce an order on Monday for about 100 Boeing ( BA )

airplanes coinciding with the visit of South Korean

President Lee Jae Myung to Washington, sources told Reuters.

The order, the largest in the Korean air carrier's history,

is expected to include a mix of 787s, 777s and 737 Boeing ( BA )

airplanes, the sources said. Boeing Commercial Airplanes CEO

Stephanie Pope and Korean Air CEO Cho Won-tae were both

attending an event of business leaders with the South Korean

leader in Washington. Boeing ( BA ) declined to comment.