Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Unaudited Condensed Consolidated Financial Statements of the Company have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”), consistent in all material respects with those applied in the 2025 Form 10-K, for interim financial information and in accordance with the rules and regulations of the SEC. Therefore, they do not include all information and footnotes normally included in annual consolidated financial statements and should be read in conjunction with the consolidated financial statements and notes thereto included in the 2025 Form 10-K. In the opinion of management, the Unaudited Condensed Consolidated Financial Statements contain all adjustments (consisting principally of normal recurring accruals) necessary for a fair presentation of the Condensed Consolidated Balance Sheets, Statements of Income, Statements of Comprehensive Income, Statements of Redeemable Preferred Stock and Shareholders’ Equity, and Statements of Cash Flows for such interim periods presented. Operating results for interim periods are not necessarily indicative of the results that can be expected for a full year. Certain reclassifications have been made to the prior year presentation to conform to the current year presentation. These reclassifications had no effect on the reported total revenue, income from operations, or net income. The following is a summary of the changes to the presentation in the Condensed Consolidated Statements of Income for the three months ended March 31, 2025: •Management and advisory fees primarily consist of fees earned from the Company’s investment fund partnerships in its role as general partner and fees related to servicing the Willis Mitsui & Company Engine Support Limited (“WMES”) and third-party lease portfolios, including ongoing management and transactional services such as marketing and procurement. In prior periods, servicing fees were included in “Other revenue.” For the three months ended March 31, 2025, $2.0 million was reclassified to “Management and advisory fees,” with a corresponding decrease to “Other revenue.” In accordance with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period. In preparing these Unaudited Condensed Consolidated Financial Statements, management has made its best estimates and judgments of certain amounts included therein, giving due consideration to materiality. These estimates and judgments are based on historical experience and other assumptions that management believes are reasonable and take into account the economic implications of factors such as changes in interest rates, inflation, and new or increased tariffs on the Company’s critical and significant accounting estimates. The application of these accounting policies requires the use of judgment and assumptions regarding matters that are inherently uncertain; accordingly, actual results may differ materially from those estimates. Significant estimates reflected in the accompanying Unaudited Condensed Consolidated Financial Statements include, among others, those related to intangible assets, long-lived assets, equipment held for sale, allowances for doubtful accounts and credit losses, inventory, deferred in-substance fixed payment use fees included in “Unearned revenue” on the Condensed Consolidated Balance Sheets, the Company’s share of earnings or losses from equity method investments based on net asset value, which reflects changes in the fair value of the underlying investments, and income taxes. Given the uncertainty surrounding future changes in interest rates, inflation, potential new or increased tariffs, and broader macroeconomic and geopolitical conditions, the Company will continue to evaluate the nature and extent of such impacts on its business, results of operations, and financial condition.
Principles of Consolidation	Principles of Consolidation The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries, as well as VIEs, for which the Company is the primary beneficiary, in accordance with consolidation guidance. The Company evaluates all entities in which it has an economic interest to determine whether such entities are VIEs or voting interest entities (“VOEs”). For entities determined to be VIEs, the Company consolidates the entity if it has a controlling financial interest, defined as the power to direct the activities that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the entity. For entities determined to be VOEs, the Company consolidates the entity when it has a controlling financial interest, generally evidenced by ownership of a majority of the voting interests. Intercompany transactions and balances have been eliminated in consolidation.
Risks and Uncertainties	Risks and Uncertainties The Company continues to monitor global macroeconomic and geopolitical conditions, including changes in interest rates, inflation, tariffs, ongoing conflicts, and the price of jet fuel, which may contribute to market volatility and potential disruptions to global aviation operations. The duration and scope of these conflicts, including the potential for further regional escalation, remain uncertain and could adversely affect the global economy, financial markets, and our customers, which in turn could impact the Company. The ultimate extent of any such impacts will depend on future developments that are highly uncertain and not reasonably estimable at this time, and such impacts could persist for an extended period. Other than what has been reflected in the Unaudited Condensed Consolidated Financial Statements, the Company is not aware of any specific event or circumstance that would require it to update its estimates or judgments or adjust the carrying value of its assets or liabilities. Actual results could differ from those estimates and any such differences may be material to the Unaudited Condensed Consolidated Financial Statements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recent Accounting Pronouncements Adopted by the Company In July 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2025-05, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets.” The ASU provides public entities with a practical expedient when estimating expected credit losses for accounts receivable and contract assets. The practical expedient assumes that current conditions of the balance sheet do not change for the remaining life of the asset. The Company adopted ASU 2025-05 as of January 1, 2026 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. Recent Accounting Pronouncements To Be Adopted by the Company In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-04) Disaggregation of Income Statement Expenses.” The ASU requires public entities, on both an interim and annual basis, to disclose additional disaggregated information about specific expense categories in the notes to the financial statements. The ASU is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company expects to adopt this accounting standard update for the year ended December 31, 2027 and is currently evaluating the potential effects on the consolidated financial statements and related disclosures. In December 2025, the FASB issued ASU 2025-10, “Accounting for Government Grants Received by Business Entities.” The ASU provides guidance on the recognition, measurement, presentation, and disclosure of government grants. The ASU is effective for fiscal years beginning after December 15, 2028, with early adoption permitted. The Company is currently evaluating the impact of adopting this new pronouncement. In December 2025, the FASB issued ASU 2025-11, “Interim Reporting (Topic 270): Narrow-Scope Improvements.” The amendments in this ASU are effective for interim reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact of adopting this new pronouncement.
Government Grant Income	Government Grant Income Historically, there was no specific guidance in GAAP that addresses the recognition and measurement of government assistance received by a business entity. In the absence of authoritative GAAP guidance, the Company considered the application of other authoritative accounting guidance by analogy and concluded that the guidance outlined in International Accounting Standard 20 – Accounting for Government Grants and Disclosures of Government Assistance (“IAS 20”) was the most appropriate. Under IAS 20, grant income is recognized to the extent that there is reasonable assurance that the Company will comply with the conditions attached to the grant, and the grant will be received.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2026

The accompanying Unaudited Condensed Consolidated Financial Statements of the Company have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”), consistent in all material respects with those applied in the 2025 Form 10-K, for interim financial information and in accordance with the rules and regulations of the SEC. Therefore, they do not include all information and footnotes normally included in annual consolidated financial statements and should be read in conjunction with the consolidated financial statements and notes thereto included in the 2025 Form 10-K. In the opinion of management, the Unaudited Condensed Consolidated Financial Statements contain all adjustments (consisting principally of normal recurring accruals) necessary for a fair presentation of the Condensed Consolidated Balance Sheets, Statements of Income, Statements of Comprehensive Income, Statements of Redeemable Preferred Stock and Shareholders’ Equity, and Statements of Cash Flows for such interim periods presented. Operating results for interim periods are not necessarily indicative of the results that can be expected for a full year.

Certain reclassifications have been made to the prior year presentation to conform to the current year presentation. These reclassifications had no effect on the reported total revenue, income from operations, or net income. The following is a summary of the changes to the presentation in the Condensed Consolidated Statements of Income for the three months ended March 31, 2025:

•Management and advisory fees primarily consist of fees earned from the Company’s investment fund partnerships in its role as general partner and fees related to servicing the Willis Mitsui & Company Engine Support Limited (“WMES”) and third-party lease portfolios, including ongoing management and transactional services such as marketing and procurement. In prior periods, servicing fees were included in “Other revenue.” For the three months ended March 31, 2025, $2.0 million was reclassified to “Management and advisory fees,” with a corresponding decrease to “Other revenue.”

In accordance with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period. In preparing these Unaudited Condensed Consolidated Financial Statements, management has made its best estimates and judgments of certain amounts included therein, giving due consideration to materiality. These estimates and judgments are based on historical experience and other assumptions that management believes are reasonable and take into account the economic implications of factors such as changes in interest rates, inflation, and new or increased tariffs on the Company’s critical and significant accounting estimates.

The application of these accounting policies requires the use of judgment and assumptions regarding matters that are inherently uncertain; accordingly, actual results may differ materially from those estimates. Significant estimates reflected in the accompanying Unaudited Condensed Consolidated Financial Statements include, among others, those related to intangible assets, long-lived assets, equipment held for sale, allowances for doubtful accounts and credit losses, inventory, deferred in-substance fixed payment use fees included in “Unearned revenue” on the Condensed Consolidated Balance Sheets, the Company’s share of earnings or losses from equity method investments based on net asset value, which reflects changes in the fair value of the underlying investments, and income taxes.

Given the uncertainty surrounding future changes in interest rates, inflation, potential new or increased tariffs, and broader macroeconomic and geopolitical conditions, the Company will continue to evaluate the nature and extent of such impacts on its business, results of operations, and financial condition.

Principles of Consolidation

The accompanying Unaudited Condensed Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries, as well as VIEs, for which the Company is the primary beneficiary, in accordance with consolidation guidance. The Company evaluates all entities in which it has an economic interest to determine whether such entities are VIEs or voting interest entities (“VOEs”).

For entities determined to be VIEs, the Company consolidates the entity if it has a controlling financial interest, defined as the power to direct the activities that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the entity. For entities determined to be VOEs, the Company consolidates the entity when it has a controlling financial interest, generally evidenced by ownership of a majority of the voting interests. Intercompany transactions and balances have been eliminated in consolidation.

Risks and Uncertainties

The Company continues to monitor global macroeconomic and geopolitical conditions, including changes in interest rates, inflation, tariffs, ongoing conflicts, and the price of jet fuel, which may contribute to market volatility and potential disruptions to global aviation operations.

The duration and scope of these conflicts, including the potential for further regional escalation, remain uncertain and could adversely affect the global economy, financial markets, and our customers, which in turn could impact the Company. The ultimate extent of any such impacts will depend on future developments that are highly uncertain and not reasonably estimable at this time, and such impacts could persist for an extended period.

Other than what has been reflected in the Unaudited Condensed Consolidated Financial Statements, the Company is not aware of any specific event or circumstance that would require it to update its estimates or judgments or adjust the carrying value of its assets or liabilities. Actual results could differ from those estimates and any such differences may be material to the Unaudited Condensed Consolidated Financial Statements.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted by the Company

In July 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2025-05, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets.” The ASU provides public entities with a practical expedient when estimating expected credit losses for accounts receivable and contract assets. The practical expedient assumes that current conditions of the balance sheet do not change for the remaining life of the asset. The Company adopted ASU 2025-05 as of January 1, 2026 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements.

Recent Accounting Pronouncements To Be Adopted by the Company

In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-04) Disaggregation of Income Statement Expenses.” The ASU requires public entities, on both an interim and annual basis, to disclose additional disaggregated information about specific expense categories in the notes to the financial statements. The ASU is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company expects to adopt this accounting standard update for the year ended December 31, 2027 and is currently evaluating the potential effects on the consolidated financial statements and related disclosures.

In December 2025, the FASB issued ASU 2025-10, “Accounting for Government Grants Received by Business Entities.” The ASU provides guidance on the recognition, measurement, presentation, and disclosure of government grants. The ASU is effective for fiscal years beginning after December 15, 2028, with early adoption permitted. The Company is currently evaluating the impact of adopting this new pronouncement.

In December 2025, the FASB issued ASU 2025-11, “Interim Reporting (Topic 270): Narrow-Scope Improvements.” The amendments in this ASU are effective for interim reporting periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact of adopting this new pronouncement.

Government Grant Income

Historically, there was no specific guidance in GAAP that addresses the recognition and measurement of government assistance received by a business entity. In the absence of authoritative GAAP guidance, the Company considered the application of other authoritative accounting guidance by analogy and concluded that the guidance outlined in International Accounting Standard 20 – Accounting for Government Grants and Disclosures of Government Assistance (“IAS 20”) was the most appropriate. Under IAS 20, grant income is recognized to the extent that there is reasonable assurance that the Company will comply with the conditions attached to the grant, and the grant will be received.