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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Property, Plant and Equipment [Table Text Block] | Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives less an estimated salvage value, which are as follows:
| Estimated Useful Life | Estimated Salvage Value
Aircraft and other flight equipment: |  |
Boeing 737 and E175 aircraft | 20-25 years | 10%
Bombardier Q400 aircraft | 15 years | 5%
Buildings | 25 - 40 years | 10%
Minor building and land improvements | 10 years | —%
Capitalized leases and leasehold improvements | Generally shorter of lease term or estimated useful life | —%
Computer hardware and software | 3-10 years | —%
Other furniture and equipment | 5-10 years | —%

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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