Code One

Code One is the name of the Republic of Korea Air Force aircraft which carries the President of South Korea. The current aircraft used as Code One is a Boeing 747-400 leased from Korean Air.
Historically, the lease for Code One has been filled by either Korean Air or Asiana Airlines. It was reported in 2018 that Korean Air's lease expires in March 2021, and that a bidding process was open to secure a new lease. Government officials said that low-cost carriers might be requested to submit bids, in addition to those requested of Asiana Airlines and Korean Air.
The chosen aircraft will undergo a "full-scale renovation" which will include "decorating the exterior", as well as customizing the interior to include a sleeping area and office, as well as reinforcement to protect the president's security.
As of May 2020 the South Korean Government has chosen the Boeing 747-8I Intercontinental as the new Code One. The new presidential plane will enter service in November 2021 after extensive retrofitting and inspection, There will also be an identical plane of the same type that will travel with the President at all times for security purposes and to act as a backup in case of an emergency.
Acquirement.
In 2010 as part of the VC-X program the Republic of Korea Air Force along with the Presidential Security Service leased a Boeing 747-400 from Korean Air to serve as the current Code One. In March 2020 the lease for the current Code One ends and the bidding process from Korean Air and Asiana Airlines will begin and when the bidding process is concluded the South Korean Air Force and the Presidential Security Service will decide who will get the contract to provide the new Code One aircraft.
Other presidential aircraft.
Before 2010, the President would travel in a reconfigured Boeing 747 provided by either Korean Air or Asiana Airlines, that would temporarily serve as the Code One, with the Presidential seal being displayed, so it was noted that the President was on board. When official use was over the aircraft was reverted to normal and used once again as a commercial aircraft.
Security.
Code One has a vast array of security measures most of which are highly classified. Code One is equipped with advanced communications and defense systems including radar-signal jammers and flares to deflect against heat seeking missiles.
Interior.
The interior of the aircraft is mostly unknown and classified, but what is known, is that the aircraft is reconfigured with an office and a bedroom among other amenities. Code One is not only meant for travel and comfort, but also as a command post, that is used for the President to lead the country from anywhere in the world. It is also meant for them to fulfill their duties as the Commander in Chief and supreme authority of the armed forces.