Deerns was involved with the development of Kuala Lumpur International Terminal. An consultant was based in Malaysia for 5 years during construction (1993-1998). The Malaysian Airports Authority requested Deerns to make sure they had the expertise on board to supervise the construciton of the airport systems.
As such Deerns was intrusmental for the world class airport that KL international is today. Particularly during the development of the ATCT and Navigational Aids, as well as the telecommunications for the entire airport terminal.