Bug Checkpoint

else if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 519 && flyjob[playerid] == 1 && IsPlayerInRangeOfPoint(playerid, 10.0, 1980.8196,-2493.8984,13.5391))
    {
        //DisablePlayerCheckpoint(playerid);
        SetPlayerCheckpoint(playerid, -1541.5569,-159.0307,14.1484, 10);
        GameTextForPlayer(playerid, "~g~Goto San Fierro!", 3000, 3);
    }
    else if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 519 && flyjob[playerid] == 1 && IsPlayerInRangeOfPoint(playerid, 10.0, -1541.5569,-159.0307,14.1484))
    {
        //DisablePlayerCheckpoint(playerid);
        SetPlayerCheckpoint(playerid, -1657.4930,-164.7600,14.1484, 10);
        GameTextForPlayer(playerid, "~g~Goto Landing!", 3000, 3);
    }
    else if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 519 && flyjob[playerid] == 1 && IsPlayerInRangeOfPoint(playerid, 10.0, -1657.4930,-164.7600,14.1484))
    {
        //DisablePlayerCheckpoint(playerid);
        SetPlayerCheckpoint(playerid, 1571.4313,1556.9706,10.8203, 10);
        GameTextForPlayer(playerid, "~g~Goto Las Venturas!", 3000, 3);
    }
    else if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 519 && flyjob[playerid] == 1 && IsPlayerInRangeOfPoint(playerid, 10.0, 1571.4313,1556.9706,10.8203))
    {
        //DisablePlayerCheckpoint(playerid);
        SetPlayerCheckpoint(playerid, 1477.3678,1697.1982,10.8125, 10);
        GameTextForPlayer(playerid, "~g~Goto Landing!", 3000, 3);
    }
    else if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 519 && flyjob[playerid] == 1 && IsPlayerInRangeOfPoint(playerid, 10.0, 1477.3678,1697.1982,10.8125))
    {
        //DisablePlayerCheckpoint(playerid);
        SetPlayerCheckpoint(playerid, 1904.6438,-2462.9121,13.5391, 10);
        GameTextForPlayer(playerid, "~g~Goto Los Santos!", 3000, 3);
    }
    else if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 519 && flyjob[playerid] == 1 && IsPlayerInRangeOfPoint(playerid, 10.0, 1904.6438,-2462.9121,13.5391))
    {
        DisablePlayerCheckpoint(playerid);
        SetVehicleToRespawn(1);
        GameTextForPlayer(playerid, "~g~Mission Success!", 3000, 3);
        flyjob[playerid] = 0;
    }