Create navbar dropdown menu list with url tags

Hi,
I have a model and whould like to create a dropdown menu from the fields generated.
Unfortunately no dropdown list is showed:
 <ul class="dropdown-menu" >
                 {% for airline in alirlines %}

                <li><a href="/airline_detail/{{airline.code}}">{{ airline.airline }}</a></li>
               {% endfor %}
              
              </ul>

this is the model:
class Airline(models.Model):
     airline = models.CharField(max_length=50)
     prefix = models.CharField(max_length=3)
     code= models.CharField(max_length=3)
     ticker = models.CharField(max_length=1)


can anyone help? thanks

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