[Gamer_Z]

only and only map andreas, if u want to do it with area's good luck with speed and amount of code, just use this:
just an example

pawn Код:

IsPlayerInAir(playerid){
  new Float:varx,Float:vary,Float:varz,Float:var1,Float:diff;
  GetPlayerPos(playerid, varx, vary, varz);
  MapAndreas_FindZ_For2DCoord(varx, vary, var1);
  if(varz < var1){
    diff = varz-var1;
    if(diff > 5){
      return 1;// player is in air
    }else{
      return 0;//player is on the ground
    }
  }else
  if(varz => var1){
    diff = var1-varz;
    if(diff > 5){
      return -1;// player is under ground
    }else{
      return 0;//player is on the ground
    }
  }
  return 0;
}