Final answer:
Obtain the necessary billing information from the aircraft's maintenance log or records when servicing an Air Force aircraft without an identaplate.
Step-by-step explanation:
When servicing an Air Force aircraft that does not have an identaplate, the necessary billing information should be obtained from the aircraft's maintenance log or records. These documents typically contain details about the aircraft's maintenance, repairs, and related costs. By referring to the maintenance log or records, the service provider can accurately determine the billing information for the work done on the aircraft.