Easily spawn an enemy jet to patrol an AO in Arma 3 with a script.

// Spawn a CAS jet to patrol the AO.
 
#define PLANE_TYPE "rhs_l159_CDF","rhs_l39_cdf","rhs_mig29s_vmf","RHS_Su25SM_vvsc","RHS_T50_vvs_generic","RHS_T50_vvs_generic_ext","RHS_T50_vvs_blueonblue"
 
_plane = createVehicle [([PLANE_TYPE] call BIS_fnc_selectRandom), [0,0,0], [], 0, "FLY"];
 
_plane addEventHandler ["Fired",{
	(_this select 0) setVehicleAmmo 1
}];
 
_pilotguy = [[0,0,0], EAST, ["rhs_pilot"],[],[],[],[],[],232] call BIS_fnc_spawnGroup;
 
((units _pilotguy) select 0) moveInDriver _plane;
 
_wpcas = _pilotguy addWaypoint [getmarkerPos "aoMarker", 4500];
_wpcas setWaypointType "LOITER";
_wpcas setWaypointLoiterRadius 4500;
_wpcas setWaypointLoiterType "CIRCLE_L";
_wpcas setWaypointBehaviour "AWARE";
_wpcas setWaypointCombatMode "RED";

_randTanks90 = [[23762.7,18920.1,3.33786e-006] , 0, 400, 10, 0, 0.3, 0] call BIS_fnc_findSafePos;
 
_newtanks29 = [_randTanks90, EAST, (configFile >> "CfgGroups" >> "EAST" >> "OPF_F" >> "Armored" >> "OIA_TankPlatoon")] call BIS_fnc_spawnGroup;
 
[_newtanks29, man1 getRelPos [15, 0], 600] call bis_fnc_taskPatrol;

_randPos11 = [getPos heli99 , 0, 1200, 12, 0, 0.3, 0] call BIS_fnc_findSafePos;
_heli1 = [_randPos11, 0, "O_Heli_Attack_02_F", EAST] call BIS_fnc_spawnVehicle;
 
_group_ifrit1 = _heli1 select 2;
_wp = _group_ifrit1 addWaypoint [getPosATL man1, 0];
_wp setWaypointBehaviour "SAFE";
_wp setWaypointCombatMode "GREEN";
_wp setWaypointCompletionRadius 1300;
_wp setWaypointSpeed "FULL";
_wp setwaypointType "GETOUT";
 
_group_ifrit1 = _heli1 select 2;
_wp2 = _group_ifrit1 addWaypoint [getPosATL man1, 0];
_wp2 setWaypointBehaviour "SAFE";
_wp2 setWaypointCombatMode "GREEN";
_wp2 setWaypointCompletionRadius 1300;
_wp2 setWaypointSpeed "FULL";
_wp2 setwaypointType "DISMISSED";

// Find a random area to spawn the HQ. This is within the area of the marker "mkr1".
 
_mrk = "mkr1";
_area = markerSize _mrk;
_nul = _area pushBack markerDir _mrk;
_nul = _area pushBack ( markerShape _mrk isEqualTo "Rectangle" );
_pos = [ _mrk, _area ] call BIS_fnc_randomPosTrigger;
 
_randPos = [_pos , 0, 1200, 12, 0, 0.3, 0] call BIS_fnc_findSafePos;
 
_cargo = "Land_Cargo_HQ_V1_F" createVehicle _randPos;
 
_randPos14 = _cargo getRelPos [9, 12];
 
_mg13 = createVehicle ["O_GMG_01_high_F", _randPos14, [], 0, "CAN_COLLIDE"];
 
_mgguy13 = [_randPos14, EAST, ["O_Soldier_F"],[],[],[],[],[],232] call BIS_fnc_spawnGroup;
 
((units _mgguy13) select 0) moveInGunner _mg13;
 
// Spawning the radio tower.
 
_randPos2 = [_pos , 0, 1200, 10, 0, 0.3, 0] call BIS_fnc_findSafePos;
 
_tower = "Land_TTowerBig_1_F" createVehicle _randPos2;
_tower setVectorUp [0,0,1]; // Make sure the tower is not leaning.
 
_towerbox = "Land_spp_Transformer_F" createVehicle _randPos2;
_towerbox setVectorUp [0,0,1];
 
_towerbox2 = "Land_TTowerSmall_1_F" createVehicle _randPos2;
_towerbox2 setVectorUp [0,0,1];
 
_tower setVehicleVarName "tower1"; tower1 = _tower;
 
_genny = _tower getRelPos [7, 9];
 
// Spawn a random minefield around the radio tower.
// *********************************************************************
 
_initialPos = getPos tower1; // Pos of tower.
for "_count" from 1 to 50 do {
	_minePos = [
		(_initialPos select 0) + ((random 80) - 40),
		(_initialPos select 1) + ((random 80) - 40)
	];
	_minen = createMine [
		"APERSBoundingMine",
		_minePos,
		[],
		0
	];
};
 
// End mine code.
// *********************************************************************
 
_minefield = "Land_PowerGenerator_F" createVehicle _genny;
 
// Spawning a MG guy near tower.
 
_randPos3 = [_randPos2, 1, 60, 3, 0, 20, 0] call BIS_fnc_findSafePos;
 
_mg = createVehicle ["O_HMG_01_high_F", _randPos3, [], 0, "CAN_COLLIDE"];
 
_mgguy = [_randPos3, EAST, ["O_Soldier_F"],[],[],[],[],[],232] call BIS_fnc_spawnGroup;
 
((units _mgguy) select 0) moveInGunner _mg;
 
 
// Spawning a couple of infantry groups to defend the HQ.
// *********************************************************************
 
_hqdef2 = _cargo getRelPos [-96, 256];
 
_group = [_hqdef2, EAST, configfile >> "CfgGroups" >> "East" >> "OPF_F" >> "Infantry" >> "OIA_InfSquad_Weapons"] call BIS_fnc_spawnGroup;
 
private _buildingPositions = _cargo buildingPos -1;
private _buildingPosition = [0,0,0];
if (!(_buildingPositions isEqualTo [])) then {
    {
        if (_buildingPositions isEqualTo []) exitWith {};
        _buildingPosition = selectRandom _buildingPositions;
        _x setPos _buildingPosition;
		_x disableAI 'PATH';
        _buildingPositions deleteAt (_buildingPositions find _buildingPosition);
    } forEach (units _group);
};
 
_randPos99 = [_pos , 0, 1200, 12, 0, 0.3, 0] call BIS_fnc_findSafePos;
 
_towerhq = "CamoNet_OPFOR_big_Curator_F" createVehicle _randPos99;
_towerSTUFF = "Box_East_Grenades_F" createVehicle _randPos99;
_ammo1 = _towerSTUFF getRelPos [2, 2];
box1 = "O_supplyCrate_F" createVehicle _ammo1;
 
_ammo2 = _towerSTUFF getRelPos [-2, 2];
box2 = "Box_East_WpsLaunch_F" createVehicle _ammo1;
 
_ammo3 = _towerSTUFF getRelPos [3, 2];
box3 = "Box_East_Ammo_F" createVehicle _ammo1;
 
_ammo4 = _towerSTUFF getRelPos [3, 4];
box4 = "Box_East_Wps_F" createVehicle _ammo1;
 
_hqdef3 = _towerhq getRelPos [16, 23];
 
_group99 = [_hqdef3, EAST, configfile >> "CfgGroups" >> "East" >> "OPF_T_F" >> "Infantry" >> "OIA_InfSquad_Weapons"] call BIS_fnc_spawnGroup;
 
[_group99, getPos _towerhq, 300] call bis_fnc_taskPatrol;
 
_officer = _group createUnit ["O_officer_F",_randPos3,[],0.6,"Colonel"];
_officer setVehicleVarName "man1"; man1 = _officer;
man1 setpos (_cargo buildingpos 1);
_officer disableAI 'PATH';
 
// *********************************************************************
 
//Spawn the group
private "_group2";
_group2 = [_randPos3, EAST, configfile >> "CfgGroups" >> "East" >> "OPF_T_F" >> "Infantry" >> "OIA_InfSquad_Weapons"] call BIS_fnc_spawnGroup;
 
//Make the group defend the area.
 
[_group2, _randPos] call bis_fnc_taskDefend;