- You need CLEO 4.3   I didn't tested this mod in lower versions of CLEO

- Move all files that is INSIDE the "Aircraft Music" to "cleo" folder
"cleo" folder is in folder where your GTA: SA is located

- Open the "AIR_MUSIC" file

- Select "air1.mp3" file and copy-paste it 10 times
WARNING: When you copy-paste the "air1.mp3" 10 times, the file will become 300mb
This is why I'm leaving this part for you
(There must be another way for randomly playing musics to avoid this huge file but its been few days since I'm lerning modding)

- Re-name the files but ONLY change numbers
Folder should look like this:
air1
air2
air3
air4
air5
air6
air7
air8
air9
air10

- If you completed all the steps above,
launch the game or read "How to Edit" file