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:
|  |  | Year Ended December 31, | Year Ended December 31, | Year Ended December 31, | Year Ended December 31, | Year Ended December 31, |
| --- | --- | --- | --- | --- | --- | --- |
|  |  | 2019 | 2018 (a) | 2017 (a) | 2016 | 2015 |
| Income Statement Data (in millions, except per share amounts): | Operating revenue | $43,259 | $41,303 | $37,784 | $36,558 | $37,864 |
| Income Statement Data (in millions, except per share amounts): | Operating expense | 38,958 | 38,074 | 34,166 | 32,214 | 32,698 |
| Income Statement Data (in millions, except per share amounts): | Operating income | 4,301 | 3,229 | 3,618 | 4,344 | 5,166 |
| Income Statement Data (in millions, except per share amounts): | Net income | 3,009 | 2,122 | 2,143 | 2,234 | 7,340 |
| Income Statement Data (in millions, except per share amounts): | Basic earnings per share | 11.63 | 7.70 | 7.08 | 6.77 | 19.52 |
| Income Statement Data (in millions, except per share amounts): | Diluted earnings per share | 11.58 | 7.67 | 7.06 | 6.76 | 19.47 |
| Balance Sheet Data at December 31 (in millions): | Unrestricted cash, cash equivalents and short-term investments | $4,944 | $3,950 | $3,798 | $4,428 | $5,196 |
| Balance Sheet Data at December 31 (in millions): | Total assets | 52,611 | 49,024 | 47,469 | 40,208 | 40,861 |
| Balance Sheet Data at December 31 (in millions): | Debt and finance lease obligations (b) | 14,818 | 13,792 | 13,576 | 11,705 | 11,759 |
Question:
What is total income of United Airlines in 2017?
Answer:
2,143