如何在单击按钮时获取html表中的行之一的值？

我有一个表，其中包含从数据库加载的数据，并且每个行对应一个按钮。在按钮上单击，我希望存储在列之一中的数据存储在会话变量中，以便我可以在另一页中使用它

<?php
            $con = mysqli_connect("localhost:3306","root","","travels");
            session_start();
            // Check connection
            if (mysqli_connect_errno())
            {
                 echo "Failed to connect to MySQL: " . mysqli_connect_error();
            }

            $air1=$_POST['air'];
            $source=$_POST['source'];
            $dest=$_POST['destination'];

            $sql1="SELECT flight_code,from_source,to_dest,arrival_time,departure_time,date_of_flight from flight_info INNER JOIN
                airline_info on flight_info.a_code=airline_info.a_code and flight_info.from_source='$source' and 
                flight_info.to_dest='$dest' and airline_info.a_name='$air1' and flight_info.date_of_flight> CURDATE() and flight_info.seats_available>0;";

            $result=mysqli_query($con,$sql1);

            if($source==$dest)
            {
                header('Location: Error.html');
            }
            else if(mysqli_num_rows($result) > 0)
            {
                while($row = mysqli_fetch_array($result))
                {
                    echo "<tr>";
                        echo "<td width=15%>" . $row['flight_code'] . "</td>";
                        echo "<td width=20%>" . $row['from_source'] . "</td>";
                        echo "<td width=20%>" . $row['to_dest'] . "</td>";
                        echo "<td width=20%>" . $row['departure_time'] . "</td>";
                        echo "<td width=15%>" . $row['arrival_time'] . "</td>";
                        echo "<td width=10%>" . $row['date_of_flight'] . "</td>";
                        echo "<form action='Booking.html' method='post'> ";
                        echo "<td width=15%><button type='submit' name='submit' class='btn btn-primary'>Book</button></td>";
                        echo "</form>";
                    echo "</tr>";
                }
             echo "</table>";
            } 
            else
            {
                $_SESSION['source']=$source;
                $_SESSION['dest']=$dest;
                header('Location:Flight-unavailable.php');
            }
?>

the image shows the scenario and on the button click i want the flight number to be stored in a session variable so that i can then use it in the next page

任何帮助，将不胜感激