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STOCK PLANS | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
STOCK PLANS | STOCK PLANS Share-based Compensation The Company accounts for share-based compensation utilizing fair value, which is determined on the date of grant for all instruments. The Consolidated Statement of Income (Loss) for the years ended December 31, 2021, 2020, and 2019, reflects share-based compensation expense of $58 million, $17 million, and $55 million, respectively. The total tax impact recognized in earnings from share-based compensation arrangements for the years ended December 31, 2021, 2020, and 2019, was not material. As of December 31, 2021, there was $36 million of total unrecognized compensation cost related to share-based compensation arrangements, which is expected to be recognized over a weighted-average period of 1.7 years. The Company expects substantially all unvested shares associated with time-based restricted stock unit awards to vest. Restricted Stock Units and Stock Grants Under the Company’s Amended and Restated 2007 Equity Incentive Plan ("2007 Equity Plan"), which has been approved by Shareholders, the Company granted restricted stock units ("RSUs") and performance-based restricted stock units ("PBRSUs") to certain Employees during 2021, 2020, and 2019. The RSUs are scheduled to vest with respect to one-third of the shares covered thereby annually. Other than in connection with death or disability, vesting is subject to the individual’s continued service as an Employee, Board member, or advisor through the vesting date. However, with respect to the RSUs granted in 2021, provided that the individual's service has terminated no earlier than 12 months after the date of grant, in the event of a “qualified retirement,” any outstanding unvested RSUs will remain outstanding as if the individual’s service has not terminated and will continue to vest in accordance with the schedule set forth in the notice of the grant. An individual's termination of service will be considered a "qualified retirement" if (a) the individual has completed at least 10 years of continuous service; (b) the individual’s age plus completed years of continuous service equal at least 65 at the time of the individual’s termination of service; and (c) the individual has not been terminated for cause. With respect to PBRSUs granted in 2021, the number of PBRSUs vesting on the vesting date will be interpolated based on the Company's cumulative Adjusted Earnings Before Interest, Taxes, Depreciation, and Amortization (EBITDA) for the years 2022 and 2023 and ranges from 10 percent of granted PBRSUs to 300 percent of granted PBRSUs, only after a minimum performance level has been achieved. However, in the event the Company's pre-tax return on invested capital exceeds the median (i.e., 50th percentile) return on invested capital of certain of the Company's peer group of domestic mainline carriers subject to the Securities and Exchange Commission's reporting requirements, the minimum number of PBRSUs that will vest, as of the vesting date, will be equal to the grant amount times 50 percent. With respect to PBRSUs granted in 2021, provided that the individual's service has terminated no earlier than 12 months after the date of grant, in the event of a “qualified retirement,” such individual’s PBRSUs will remain outstanding as if the individual’s service has not terminated and will otherwise be settleable in accordance with the notice of grant and applicable terms and conditions; however, the number of shares received upon settlement will be prorated based on the individual’s number of days of service between the date of grant and the end of the performance period. Under the 2019 and 2020 grants, PBRSUs granted are subject to the Company’s performance with respect to a three-year simple average of return on invested capital, after taxes and excluding special items, for the defined performance period and are also subject generally to the individual’s continued employment or service. Under the 2019 and 2020 grants, the number of PBRSUs vesting on the vesting date will be interpolated based on the Company's return on invested capital performance and ranges from zero PBRSUs to 200 percent of granted PBRSUs. Forfeiture rates are estimated at the time of grant based on historical actuals for similar grants, and are trued-up to actuals over the vesting period. The Company recognizes all expense on a straight-line basis over the vesting period, with any changes in expense due to the number of PBRSUs expected to vest being modified on a prospective basis. Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:
|  | All Restricted Stock Units
|  | Units (000) |  | Wtd. Average Fair Value (per share)
Outstanding December 31, 2018 |  | 1,342 |  |  | $ | 52.56 |
Granted |  | 994 |  | (a) | 57.49 |
Vested |  | (744) |  |  | 42.42 |
Surrendered |  | (47) |  |  | 57.72 |
Outstanding December 31, 2019 |  | 1,545 |  |  | 57.65 |
Granted |  | 1,235 |  | (b) | 56.89 |
Vested |  | (715) |  |  | 54.70 |
Surrendered |  | (103) |  |  | 58.04 |
Outstanding December 31, 2020, Unvested |  | 1,962 |  |  | 57.81 |
Granted |  | 1,463 |  | (c) | 46.58 |
Vested |  | (790) |  |  | 59.48 |
Surrendered |  | (74) |  |  | 51.36 |
Outstanding December 31, 2021, Unvested |  | 2,561 |  |  | 51.81 |
(a) Includes 387 thousand PBRSUs (b) Includes 519 thousand PBRSUs (c) Includes 466 thousand PBRSUs In addition, the Company granted approximately 27 thousand shares of unrestricted stock at a weighted average grant price of $60.39 in 2021, approximately 54 thousand shares at a weighted average grant price of $29.60 in 2020, and approximately 31 thousand shares at a weighted average grant price of $52.01 in 2019, to members of its Board of Directors. A remaining balance of up to 17 million shares of the Company’s common stock may be issued pursuant to grants under the 2007 Equity Plan. Employee Stock Purchase Plan Under the Amended and Restated 1991 Employee Stock Purchase Plan ("ESPP"), which has been approved by Shareholders, the Company is authorized to issue up to a remaining balance of 5 million shares of the Company’s common stock to Employees of the Company. These shares may be issued at a price equal to 90 percent of the market value at the end of each monthly purchase period. Common stock purchases are paid for through periodic payroll deductions. The following table provides information about the Company’s ESPP activity during 2021, 2020, and 2019:
Employee Stock Purchase Plan
|  |  |  |  |  | (a)
|  | Total number |  |  |  | Weighted-average
|  | of shares |  | Average |  | fair value of each
|  | purchased |  | price paid |  | purchase right
Year ended |  | (in thousands) |  | per share |  | under the ESPP
December 31, 2019 |  | 821 |  |  | $ | 47.60 |  |  | $ | 5.29 |
December 31, 2020 |  | 1,386 |  |  | $ | 34.39 |  |  | $ | 3.82 |
December 31, 2021 |  | 1,083 |  |  | $ | 47.31 |  |  | $ | 5.19 |
(a) The weighted-average fair value of each purchase right under the ESPP granted is equal to a ten percent discount from the market value of the Common Stock at the end of each monthly purchase period. Taxes Grants of RSUs result in the creation of a deferred tax asset, which is a temporary difference, until the time the RSU vests. All excess tax benefits and tax deficiencies are recorded through the income statement. Due to the treatment of RSUs for tax purposes, the Company’s effective tax rate from year to year is subject to variability.

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