Korean Air and Asiana Airlines' flight and cabin crews conduct a joint emergency evacuation drill at Korean Air's headquarters and cabin training center in Gangseo District, Seoul, Wednesday. Courtesy of Korean Air

Korean Air said Thursday it has successfully completed a joint emergency evacuation drill with Asiana Airlines cabin crew, a key milestone in the two carriers' ongoing integration process.

The drill, conducted this week at Korean Air's headquarters and cabin training center in western Seoul under the supervision of aviation safety inspectors from the Ministry of Land, Infrastructure and Transport, marked the first time the two airlines' cabin crew have trained together across two different aircraft types simultaneously.

Some 200 executives, employees and ministry officials attended the training, including Korean Air Vice Chairman and Chief Executive Woo Kee-hong.

Twenty-eight cabin crew members — 14 from each airline — took part alongside eight Korean Air flight crew.