<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> As per the <a href=https://airlinespolicy.com/unaccompanied-minors/lufthansa-unaccompanied-minor-policy/>Lufthansa Unaccompanied Minor Policy</a>, Only when using a special Lufthansa service or when they are traveling with a companion who is at least 12 years old are children between the ages of five and eleven allowed to fly alone. Children who are traveling alone and are between the ages of 12 and 17 may, however, also be cared for at the parents' request.