you can make it with many ways, I'll give u some of them.
A) Spectating player to Andromeda.
1. first, you have to spectate player to vehicle Andromeda with PlayerSpectateVehicle -
https://sampwiki.blast.hk/wiki/PlayerSpectateVehicle
2. you have to check a key OnPlayerKeyStateChange and if the key is ENTER_VEHICLE than you must get the coordinates of Andromeda and put the players in these coordinates, with GetVehiclePos(andromeda,X,Y,Z);
SetPlayerPos(playerid,X,Y,Z-2); and fix a camera with SetCameraBehindPlayer(playerid);
so player is teleported under an andromeda.
B) Spectating player to an Object (plane)
1. you have to attach a player's camera to airplane object with AttachCameraToObject(playerid, objectid);
2. you must do the same like the example A, but for this time, u must get a coordinate of Object instead of Vehicle with GetObjectPos(objectid,X,Y,Z);