This article discusses the concept of depreciation, outlining the current reporting requirements, and two common depreciation methods. It also provides a brief overview of Qantas Airways Limited and Virgin Australia Limited, areas and ways of recording depreciation and impairment in their annual reports, and the effect of differing depreciation rates on the profit of Virgin Ltd and Qantas Airways Ltd. Additionally, it explains the reasons that the choice of useful lives differ across the organisations, the discretion to choose the depreciation method and useful lives applicable to various asset classes for the organisations, factors affecting the useful lives of assets like aircrafts, and impairment of assets and current reporting requirements in the context of the two chosen organisations.