"## {{ airlines|pprint }}" can't display a dropdown menu.
It's a debug tool.
It's supposed to show two # symbol so you know you are editing the
right template then it should display a python representation of what
airlines is.
If things work as expected, you should have something like that in the page:
## [<airline object>, <airline object>, <airline object>]
If airlines is an empty list, you will get that:
## []
If airlines is not defined, you will get that:
## ''
>
https://groups.google.com/d/msgid/django-users/5261e7bd-3a2a-4f7f-917e-8c8f2879db52%40googlegroups.com.