PLAB was used to be the International Airport till June/ July
1981.
Then, RSAF and Govt had an agreement, RSAF will get PLIA (Paya
Lebar International Airport) in exchange for CGAB. Only then in
1993, PLIA became PLAB.
So Selatar Airport was handed over to Civilian but fade was
opposite of PLAB but same as CGAB.