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function getItinerary($IID){
    $connection = initDB();
    $query;

    if($IID == 0){
            $query = "SELECT * FROM Itinerary";                
        }
        else{
            $query = "SELECT * FROM Itinerary WHERE IID='".$IID."'";               
        }


    $result = mysql_query($query);
        //or die ("Query Failed ".mysql_error());

    $itineraryID = 0;
    $itineraryData;

    while($row = mysql_fetch_array($result)){   
            $GID = $row['GID'];
            $FID = $row['FID'];
            $SID = $row['SID'];
                
                //Retrieve Guest Information
            $query2 = "SELECT * FROM Guest WHERE GID='".$GID."'";
            $result2 = mysql_query($query2);
            $row2 = mysql_fetch_array($result2);
            $firstName = $row2['FirstName'];
            $lastName = $row2['LastName'];
                
                //Retrieve Travel Schedule Information
            $query3 = "SELECT * FROM Schedule WHERE SID='".$SID."'";
            $result3 = mysql_query($query3);
            $row3 = mysql_fetch_array($result3);
            $travelDate = $row3['Date'];
                
                //Retrieve Sector Information
            $query3 = "SELECT * FROM Flights WHERE FID='".$FID."'";
            $result3 = mysql_query($query3);
            $row3 = mysql_fetch_array($result3);
            $sourceSID = $row3['SourceSID'];
            $destSID = $row3['DestSID'];
            $fName = $row3['FName'];
        
            $query4 = "SELECT Sector FROM Sectors WHERE SID='".$sourceSID."'";
            $result4 = mysql_query($query4);
            $row4 = mysql_fetch_array($result4);
            $source = $row4['Sector'];
            $query4 = "SELECT Sector FROM Sectors WHERE SID='".$destSID."'";
            $result4 = mysql_query($query4);
            $row4 = mysql_fetch_array($result4);
            $dest = $row4['Sector'];
                
                //Build GuestItinerary object   
            $guestItinerary = new GuestItinerary();
        
            $guestItinerary->set_FID($FID);
            $guestItinerary->set_FName($fName);
            $guestItinerary->set_SID($SID);
            $guestItinerary->set_source($source);
            $guestItinerary->set_dest($dest);
            $guestItinerary->set_travelDate($travelDate);
        
            $guestItinerary->set_GID($GID);
            $guestItinerary->set_firstName($firstName);
            $guestItinerary->set_lastName($lastName);    
        
            $itineraryData[$itineraryID]=$guestItinerary;
            $itineraryID = $itineraryID + 1; 
        
        }

    closeDB($connection);      
    return $itineraryData;
}