Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of accounting

The accompanying unaudited condensed financial statements include the accounts of Spirit Airlines, Inc. (the "Company"). These unaudited condensed financial statements reflect all normal recurring adjustments which management believes are necessary to fairly present the financial position, results of operations and cash flows of the Company for the respective periods presented. Certain information and footnote disclosures normally included in the audited annual financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission for Form 10-Q. These unaudited interim condensed financial statements should be read in conjunction with the audited financial statements of the Company and notes thereto included in the Company's Annual Report on Form 10-K/A for the year ended December 31, 2019 filed with the Securities and Exchange Commission on April 16, 2020.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect both the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates.

Recent Accounting Developments

Recently Adopted Accounting Pronouncements

Accounting for Credit Losses

In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments - Credit Losses." The standard requires the use of an "expected loss" model on certain types of financial instruments. For accounts receivables, aircraft maintenance deposits and security deposits (recorded within other long-term assets on the Company's condensed balance sheets) the Company is required to estimate lifetime expected credit losses. The standard also amends the impairment model for available-for-sale securities and requires estimated credit losses to be recorded as allowances rather than as reductions to the amortized cost of the securities. As such, the Company is required to recognize an allowance for credit losses for its short-term available-for-sale investment securities, with the exception of U.S. Treasury securities which do no require an allowance for credit losses. The Company adopted this standard effective January 1, 2020. In connection with the adoption of this standard, the Company recognized a cumulative effect adjustment, net of tax, of $1.6 million to retained earnings on the Company's condensed balance sheets with corresponding reserves against certain of our outstanding financial instruments. These amounts were not material to the Company's financial statements individually or in the aggregate.

Cloud Computing Arrangements

In August 2018, the FASB issued ASU No. 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software." This new standard requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification ("ASC") 350-40, "Accounting for Internal-Use Software," to determine which implementation costs to capitalize as assets and amortize over the term of the hosting arrangement or expense as incurred. The Company adopted this standard effective January 1, 2020 and is applying the standard prospectively to all implementation costs incurred after the date of adoption. This adoption has not had a material impact on the Company's financial statement presentation or results.