Final answer:
Inconsistent airfare charges are typically identified using duplicate key detection methods. This helps businesses maintain accurate financial records and prevent expense fraud.
Step-by-step explanation:
Inconsistent airfare charged by employees to their company for air travel from HQ to Factory in a given month can be isolated through duplicate key detection methods. This involves analyzing the data set of all airfare transactions to identify multiple instances of the same charge, which may indicate that employees are submitting the same expense more than once. Duplicate key detection is crucial in businesses to maintain accurate expense reporting and financial accountability.