Adequate Records refers to proof that flight crews need to justify their deductible employee business expenses and travel expenses. This should be in the form of an account book, diary, statement of expense, logbook, or similar record. Flight crews should also keep documentary evidence that, together with your record, will support each element of an expense. If flight crewmembers prepare a record in a computer memory device with the aid of a logging program, it is considered an adequate record.