Create a JTable inside a JTabbedPane using Swing UI designer

I'm trying to create a frame with multiple tabs, each with a different list. I've used the Swing UI designer with Intellij to create the "assets" and then modified them in my main class file. I've looked up some examples of creating a JTable using the designer, but these don't use multiple tabs, which I think is the main problem for me right now as I am not able to figure out how to do it.

This is the code for now.

package client;

import javax.swing.*;
import javax.swing.table.TableModel;
import java.awt.event.*;

public class ATCGUI extends GUI {

    private JPanel mainPanel;
    private JTabbedPane tabbedPanel;
    private JPanel tabbedAirportInfo;

    private JScrollPane scrollPane;
    private JButton addButtonOut;
    private JButton deleteButtonOut;
    private JButton addButtonIn;
    private JButton deleteButtonIn;
    private JTable tableOut;
    private JTable tableIn;
    private JPanel panelOut;

    public ATCGUI(String AirportCode) {

        this.add(mainPanel);

        String airportID = getID(AirportCode);

        TableOut(airportID);

        pack();
        setVisible(true);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    }

    private void TableOut(String airportID){
        String[] columnNames = {"Airline", "Destination", "Aircraft"};

        Object[][] dataTest = {{"Iberia", "London", "737"}, {"AirEuropa", "Paris", "320"}, {"BritishAirways", "Berlin", "330"}};

        JTable TableOut = new JTable(dataTest, columnNames);

        setContentPane(panelOut);
    }
}

For now it shows the different tabs, but the JTable doesn't appear in any of the tabs. And I did make sure to put the JTable inside a JScrollPane.

I'm pretty new to this so maybe there's something I've missed out or just simply don't know.