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Summary of significant accounting policies (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) segment
Summary Of Significant Accounting Policies [Line Items]
Minimum aircraft age threshold for performance of impairment assessments	5 years
Minimum period for consideration as excess inventory	4 years
Carrying value of engine and airframe parts considered excess inventory | $	$ 0
Number of operating segments	1
Number of reportable segments	1
Flight Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of asset, years	25 years
Percentage of estimates for residual values of original manufacture cost	15.00%

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- Definition

Minimum Aircraft Age Threshold For Performance Of Impairment Assessments

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Other Inventory Minimum Age Threshold For Consideration As Excess Inventory

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Summary of significant accounting policies [Line Items]

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Gross amount of components of assembled products that can be sold directly or indirectly through sales of assembled products.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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