old_contents: from django import forms
  
  from .models import AircraftType, Airstrip
  import util
  
  
  class PilotModelChoiceField(forms.ModelChoiceField):
      """Because a pilot instance is really a Django User model instance, we 
      can't handle this by overriding __unicode__ at the model level (which would
      be ideal).
      """
      def label_from_instance(self, pilot):
  	return "%s, %s" % (pilot.last_name, pilot.first_name)
  
  
  class BaseModelChoiceField(forms.ModelChoiceField):
      """Airstrips are generally represented as an 'Ident (Name)' string, but for
      the Filter form only the Name component should be shown.
      """
      def label_from_instance(self, airstrip):
  	return airstrip.name
  
  
  class FilterForm(forms.Form):
      pilot = PilotModelChoiceField(
  	queryset=util.get_pilots(), 
  	empty_label="All", 
  	required=False,
      )
      
      airstrip = forms.ModelChoiceField(
  	queryset=Airstrip.objects.all().order_by('ident'),
  	empty_label="All",
  	required=False,
      )
      
      base = BaseModelChoiceField(
  	queryset=util.get_bases().order_by('name'),
  	empty_label="All",
  	required=False,
      )
      
      aircraft_type = forms.ModelChoiceField(
  	queryset=AircraftType.objects.all().order_by('name'),
  	empty_label="All",
  	required=False,
  	widget=forms.RadioSelect,
      )
      
      checkout_status = forms.ChoiceField(
  	choices=util.choices_checkout_status(),
  	initial=util.CHECKOUT_SUDAH,
  	widget=forms.RadioSelect,
      )
  
  
  class CheckoutEditForm(forms.Form):
      pilot = PilotModelChoiceField(
  	queryset=util.get_pilots(), 
  	empty_label=None,
      )
      
      airstrip = forms.ModelChoiceField(
  	queryset=Airstrip.objects.all().order_by('ident'),
  	empty_label=None,
      )
      
      aircraft_type = forms.ModelMultipleChoiceField(
  	queryset=AircraftType.objects.all().order_by('name'),
  	widget=forms.CheckboxSelectMultiple,
      )
      
      date = forms.DateField()
  
new_contents: from django import forms
  
  from .models import AircraftType, Airstrip
  import util
  
  
  class PilotModelChoiceField(forms.ModelChoiceField):
      """Because a pilot instance is really a Django User model instance, we 
      can't handle this by overriding __unicode__ at the model level (which would
      be ideal).
      """
      def label_from_instance(self, pilot):
  	return "%s, %s" % (pilot.last_name, pilot.first_name)
  
  
  class BaseModelChoiceField(forms.ModelChoiceField):
      """Airstrips are generally represented as an 'Ident (Name)' string, but for
      the Filter form only the Name component should be shown.
      """
      def label_from_instance(self, airstrip):
  	return airstrip.name
  
  
  class FilterForm(forms.Form):
      pilot = PilotModelChoiceField(
  	queryset=util.get_pilots(), 
  	empty_label="All", 
  	required=False,
      )
      
      airstrip = forms.ModelChoiceField(
  	queryset=Airstrip.objects.all().order_by('ident'),
  	empty_label="All",
  	required=False,
      )
      
      base = BaseModelChoiceField(
  	queryset=util.get_bases().order_by('name'),
  	empty_label="All",
  	required=False,
      )
      
      aircraft_type = forms.ModelChoiceField(
  	queryset=AircraftType.objects.all().order_by('name'),
  	empty_label="All",
  	required=False,
  	widget=forms.RadioSelect,
      )
      
      checkout_status = forms.ChoiceField(
  	choices=util.choices_checkout_status(),
  	initial=util.CHECKOUT_SUDAH,
  	widget=forms.RadioSelect,
      )
  
  
  class CheckoutEditForm(forms.Form):
      pilot = PilotModelChoiceField(
  	# We're defaulting to the full list, but it may be trimmed down to the
  	# request's authenticated user in the view
  	queryset=util.get_pilots(), 
  	empty_label=None,
      )
      
      airstrip = forms.ModelChoiceField(
  	queryset=Airstrip.objects.all().order_by('ident'),
  	empty_label=None,
      )
      
      aircraft_type = forms.ModelMultipleChoiceField(
  	queryset=AircraftType.objects.all().order_by('name'),
  	widget=forms.CheckboxSelectMultiple,
      )
      
      date = forms.DateField()
  
subject: Clarify what the resulting queryset may look like