I don't have any more information about the gardens but I can tell you Singapore Changi Airport was opened in 1981 and Singapore Airlines was formed. 
 There are eight airports around Singapore, but besides Changi Airport, the other seven are not open to the public - Seletar Airport, Kallang Airport, Paya Lebar Air Base, Tengah Air Base, Sembawang Air Base, Changi Air Base and Changi Air Base (East). 
 Very interesting, any more information about the Botanic Gardens? 
 Interesting, what else can you tell me about the airports in Singapore? 
 Sure. You're welcome.
There are eight airports around Singapore, but besides Changi Airport, the other seven are not open to the public - Seletar Airport, Kallang Airport, Paya Lebar Air Base, Tengah Air Base, Sembawang Air Base, Changi Air Base and Changi Air Base (East).