Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  |  |  | December 31, 2018 | December 31, 2017 |
| --- | --- | --- | --- | --- |
|  |  |  |  | As Recast |
| ASSETS | Current assets: | Cash and cash equivalents | $1,854 | $1,495 |
| ASSETS | Current assets: | Short-term investments | 1,835 | 1,778 |
| ASSETS | Current assets: | Accounts and other receivables | 568 | 662 |
| ASSETS | Current assets: | Inventories of parts and supplies, at cost | 461 | 420 |
| ASSETS | Current assets: | Prepaid expenses and other current assets | 310 | 460 |
| ASSETS | Current assets: | Total current assets | 5,028 | 4,815 |
| ASSETS | Property and equipment, at cost: | Flight equipment | 21,753 | 21,368 |
| ASSETS | Property and equipment, at cost: | Ground property and equipment | 4,960 | 4,399 |
| ASSETS | Property and equipment, at cost: | Deposits on flight equipment purchase contracts | 775 | 919 |
| ASSETS | Property and equipment, at cost: | Assets constructed for others | 1,768 | 1,543 |
| ASSETS | Property and equipment, at cost: | Total before reducing for depreciation and amortization | 29,256 | 28,229 |
| ASSETS | Property and equipment, at cost: | Less allowance for depreciation and amortization | 9,731 | 9,690 |
| ASSETS | Property and equipment, at cost: |  | 19,525 | 18,539 |
| ASSETS | Goodwill |  | 970 | 970 |
| ASSETS | Other assets |  | 720 | 786 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Accounts payable | $1,416 | $1,320 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Accrued liabilities | 1,749 | 1,700 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Air traffic liability | 4,134 | 3,495 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Current maturities of long-term debt | 606 | 348 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Total current liabilities | 7,905 | 6,863 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Long-term debt less current maturities | 2,771 | 3,320 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Air traffic liability - noncurrent | 936 | 1,070 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Deferred income taxes | 2,427 | 2,119 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Construction obligation | 1,701 | 1,390 |
| Current liabilities: | LIABILITIES AND STOCKHOLDERS' EQUITY | Other noncurrent liabilities | 650 | 707 |
| LIABILITIES AND STOCKHOLDERS' EQUITY | Stockholders' equity: | Common stock, $1.00 par value: 2,000,000,000 shares authorized;   807,611,634 shares issued in 2018 and 2017 | 808 | 808 |
| LIABILITIES AND STOCKHOLDERS' EQUITY | Stockholders' equity: | Capital in excess of par value | 1,510 | 1,451 |
| LIABILITIES AND STOCKHOLDERS' EQUITY | Stockholders' equity: | Retained earnings | 15,967 | 13,832 |
| LIABILITIES AND STOCKHOLDERS' EQUITY | Stockholders' equity: | Accumulated other comprehensive income | 20 | 12 |
| LIABILITIES AND STOCKHOLDERS' EQUITY | Stockholders' equity: | Treasury stock, at cost: 255,008,275 and 219,060,856 shares   in 2018 and 2017 respectively | (8,452) | (6,462) |
| LIABILITIES AND STOCKHOLDERS' EQUITY | Stockholders' equity: | Total stockholders' equity | 9,853 | 9,641 |
| LIABILITIES AND STOCKHOLDERS' EQUITY |  |  | $26,243 | $25,110 |
Question:
what was the air traffic liability of SouthWest in 2018?
Answer:
4,134