No spaceship exists in vanilla GTA: San Andreas. The game has:
ROCKETMAN / FLYINGTOSTUNT)Warning: Mods can corrupt saves. Backup GTASAsf1.b first. Online mods require matching server/client versions.
Vanilla cheats only give the Jetpack (L1, L2, R1, R2, Up, Down, Left, Right, L1, L2, R1, R2, Up, Down, Left, Right on PS2).