Daedo Airport Express

The Daedo Airport Express (Seomun: 大都空港鐵道, Jinmun: 대도공항철도), alternatively stylized as DAE, is a service in Daedo, Zhenia, with the aim of connecting Daedo's urban centers with the city's two airports, particularly Daedo Capital International Airport and Jinpo Airport. Although it was originally developed as direct rail shuttles between Daedo's urban center and the airports, it was reorganized to also assume roles in between. Since 1585, services on the DAE have been compartmentalized into two - a limited express service operating directly between both airports, Daedo Central Station and Shin Daedo Station; and a stopping train service that stops on all stations along the route.

DCIA and Shin Daedo extension
Originally aimed to connect Jinpo Airport and Daedo's urban center, plans to extend the Daedo Airport Express to the then-incomplete Daedo Capital International Airport (DCIA) materialized in the early 1580s. This was a particularly pressing issue for the new airport, as the lack of direct railway connection with Daedo's existing urban centers, coupled with the significant increase in traffic in the area, was expected to saturate both existing and newly-built road networks in southwestern Daedo. Extension into DCIA involved the addition of over 25 kilometers of dedicated rail between Nampo Station and the airport, as well as the construction of all stations in between the airport and the already-existing Nampo Station. The DCIA extension came into operation on April 27, 1587 - four days before the airport's Terminal 1 opened. While no additional DAE extensions were planned into the construction of the airport's concourses, the Daedo Airport Express was once again extended into Terminal 2 when it opened in 1608. As of December 1610, there are plans to add a new station between the existing Cargo Terminal Station and Terminal 1 Station, in preparation for the opening of Terminal 3 by 1620 - an idea that has been met with significant opposition.

The construction and expansion of Line 2 came in hand with the construction of Shin Daedo. The construction of Line 2 was expected to add five additional stations into the network, as well as a separate line that follows a more direct path along Daedo's western coast to Jinpo Airport. Direct services connecting the two airports along Line 2 were initially planned to stop only at Shin Daedo Station: in 1596, an additional direct service along the DAE's line between Shin Daedo Station and Daedo Central Station was launched, most likely in preparation for the 1598 Daedo International Exposition.