You may wish to add activities to the schedule that do not generate revenue. By default, all Activity Types are set to track billing status. The statuses of Unbilled/Billed/Paid are useful in making sure that you've collected on all completed flights but can cause noise when using the reservation tab to filter for Completed and Unbilled flights.
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Any activity type can be set up to no include a billing status by going to:
Settings>Scheduling>Activity Types
Selecting a type to edit, and then clicking Edit on the Billing Section
and setting the Track Billing Status switch to No