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:
|  |  |  | First Quarter | Second Quarter | Third Quarter | Fourth Quarter |
| --- | --- | --- | --- | --- | --- | --- |
| 2018 (1) | Operating revenues |  | $10,401 | $11,643 | $11,559 | $10,938 |
| 2018 (1) | Operating expenses |  | 10,005 | 10,639 | 10,874 | 10,367 |
| 2018 (1) | Operating income |  | 396 | 1,004 | 685 | 571 |
| 2018 (1) | Net income |  | 159 | 556 | 372 | 325 |
| Earnings per share: | 2018 (1) | Basic | $0.34 | $1.20 | $0.81 | $0.71 |
| Earnings per share: | 2018 (1) | Diluted | $0.34 | $1.20 | $0.81 | $0.70 |
| Shares used for computation (in thousands): | 2018 (1) | Basic | 472,297 | 463,533 | 460,526 | 460,589 |
| Shares used for computation (in thousands): | 2018 (1) | Diluted | 474,598 | 464,618 | 461,507 | 461,915 |
| 2017 | Operating revenues |  | $9,820 | $11,227 | $10,965 | $10,611 |
| 2017 | Operating expenses |  | 9,083 | 9,628 | 9,709 | 9,973 |
| 2017 | Operating income |  | 737 | 1,599 | 1,256 | 638 |
| 2017 | Net income (loss) |  | 340 | 864 | 661 | (583) |
| Earnings (loss) per share: | 2017 | Basic | $0.67 | $1.76 | $1.36 | $(1.22) |
| Earnings (loss) per share: | 2017 | Diluted | $0.67 | $1.75 | $1.36 | $(1.22) |
| Shares used for computation (in thousands): | 2017 | Basic | 503,902 | 490,818 | 484,772 | 477,165 |
| Shares used for computation (in thousands): | 2017 | Diluted | 507,797 | 492,965 | 486,625 | 477,165 |
Question:
What was American Airlines' operating income in the last quarter of 2017?
Answer:
638