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An operating lease is a lease whose term is short compared to the useful life of the asset or piece of equipment (an airliner, a ship, etc.) being leased. An operating lease is commonly used to acquire equipment on a relatively short-term basis. (Wikipedia)

Amortization usually refers to spreading an intangible asset's cost over that asset's useful life. For example, a patent on a piece of medical equipment usually has a life of 17 years. The cost involved with creating the medical equipment is spread out over the life of the patent, with each portion being recorded as an expense on the company's income statement. (Investopedia)

Repair and maintenance cost is expensed unless the useful life of the asset is materially lengthened or the productivity of the asset is materially increased. (Fundamentals of Oil & Gas Accounting by Charlotte J. Wright, ‎Rebecca A. Gallun)

You should defer expenses when generally accepted accounting principles or international financial reporting standards require that they be included in the cost of a long-term asset, and then charged to expense over a long period of time. For example, you may have to include the cost of interest in the cost of a constructed asset, such as a building, and then charge the cost of the building to expense over the useful life of the entire asset in the form of depreciation. In this case, the cost of the interest is a deferred expense. (accountingtools.com)