// Returns true if conditions are met to activate trigger. false if not.
// Compile somewhere: fnc_MyFunc = compile preProcessFileLineNumbers "fnc_myFunc.sqf";
#define MIN_PLAYERS 3

if (d_no_more_observers) exitWith { false };
if ({((getposATL _x) select 2) > 3} count _this > 0) exitWith { false }; // Flying vehicles in trigger area, exit.
// Might misunderstand the requirement, perhaps needs to move to the vehicle / player check below?

private ["_playerCount"];
_playerCount = 0;
{
   if (_x isKindOf "Man") then {
      if (isPlayer _x) then { _playerCount = _playerCount + 1 };
   } else {
     { if (isPlayer _x) then { _playerCount = _playerCount + 1 } } forEach (crew _x);
   };
   if (_playerCount >= MIN_PLAYERS) exitWith {}; // exit loop scope
} forEach _this;

if (_playerCount < MIN_PLAYERS) exitWith { false };

true;