Sultan Abdul Aziz Shah Airport or Subang Skypark or just "Subang Airport" as it is commonly known was Kuala Lumpur main airport until 1998 when KLIA was opened. The airport is located located within urban territory of Greater Kuala Lumpur and hence closer to the city centre than Kuala Lumpur.
As of May 2018, Subang Airport can easily be reach on public transport with the opening of the KTM (commuter train) connection from KL Sentral.
KTM Line: KL Sentral - Terminal Skypark
travel time: 28min
from KL Sentral: 5.30am - 9.25pm
from Subang Skypark: 7.50am - 11.20pm
In recent years the airport had been extended with new facilities and terminals under the name "SkyPark" which turned the airport into an airport / shopping mall.
SkyPark facebook page