To spawn the new Jets DLC carrier via a script is the same as creating any other vehicle. However, to orientate or reposition it, the object will not update once spawned like other standard vehicles as the carrier is multiple objects. To update the position, direction and pitchbank, there is a new function: BIS_fnc_Carrier01PosUpdate;
To spawn the carrier:
private _carrier = createVehicle ["Land_Carrier_01_base_F",<position>,,0,"None"];
To set its direction or to shift the carrier's position via a script, update the original object's attributes then run the function BIS_fnc_Carrier01PosUpdate:
_carrier setPosWorld <position>;
_carrier setDir <degree>;
[_carrier] call BIS_fnc_Carrier01PosUpdate;
The carrier will now be aligned to its base.
Example Multiplayer - Working Catapults Tested!!