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:
|  |  |  | 2018 | 2017 | 2016 | 2015 | 2014 |
| --- | --- | --- | --- | --- | --- | --- | --- |
| CONSOLIDATED OPERATING RESULTS (audited) | Operating Revenues |  | $8,264 | $7,894 | $5,925 | $5,598 | $5,368 |
| CONSOLIDATED OPERATING RESULTS (audited) | Operating Expenses |  | 7,621 | 6,686 | 4,619 | 4,300 | 4,406 |
| CONSOLIDATED OPERATING RESULTS (audited) | Operating Income |  | 643 | 1,208 | 1,306 | 1,298 | 962 |
| CONSOLIDATED OPERATING RESULTS (audited) | Nonoperating income (expense), net of interest capitalized (a) |  | (58) | (49) | 10 | 14 | 13 |
| CONSOLIDATED OPERATING RESULTS (audited) | Income before income tax |  | 585 | 1,159 | 1,316 | 1,312 | 975 |
| CONSOLIDATED OPERATING RESULTS (audited) | Net Income |  | $437 | $960 | $797 | $848 | $605 |
| CONSOLIDATED OPERATING RESULTS (audited) | Average basic shares outstanding |  | 123.230 | 123.211 | 123.557 | 128.373 | 135.445 |
| CONSOLIDATED OPERATING RESULTS (audited) | Average diluted shares outstanding |  | 123.975 | 123.854 | 124.389 | 129.372 | 136.801 |
| CONSOLIDATED OPERATING RESULTS (audited) | Basic earnings per share |  | $3.55 | $7.79 | $6.45 | $6.61 | $4.47 |
| CONSOLIDATED OPERATING RESULTS (audited) | Diluted earnings per share |  | $3.52 | $7.75 | $6.41 | $6.56 | $4.42 |
| CONSOLIDATED OPERATING RESULTS (audited) | Cash dividends declared per share |  | $1.28 | $1.20 | $1.10 | $0.80 | 0.50 |
| At End of Period (in millions): | CONSOLIDATED FINANCIAL POSITION (audited) | Total assets | $10,912 | $10,746 | $9,968 | $6,530 | $6,059 |
| At End of Period (in millions): | CONSOLIDATED FINANCIAL POSITION (audited) | Long-term debt, including current portion | $2,103 | $2,569 | $2,964 | $683 | $798 |
| At End of Period (in millions): | CONSOLIDATED FINANCIAL POSITION (audited) | Shareholders' equity | $3,751 | $3,460 | $2,744 | $2,411 | $2,127 |
| Consolidated: (b) | Revenue passengers (000) |  | 45,802 | 44,005 | 34,289 | 31,883 | 29,287 |
| Consolidated: (b) | RPMs (000,000) "traffic" |  | 54,673 | 52,338 | 37,209 | 33,578 | 30,718 |
| Consolidated: (b) | ASMs (000,000) "capacity" |  | 65,335 | 62,072 | 44,135 | 39,914 | 36,078 |
| Consolidated: (b) | Load factor |  | 83.7% | 84.3% | 84.3% | 84.1% | 85.1% |
| Consolidated: (b) | Yield |  | 13.96¢ | 13.95¢ | 14.49¢ | 14.27¢ | 14.91¢ |
| Consolidated: (b) | RASM |  | 12.65¢ | 12.72¢ | 13.43¢ | 14.03¢ | 14.88¢ |
| Consolidated: (b) | CASMex (c) |  | 8.50¢ | 8.25¢ | 8.32¢ | 8.30¢ | 8.36¢ |
| Mainline: | Revenue passengers (000) |  | 35,603 | 34,510 | 24,838 | 22,869 | 20,972 |
| Mainline: | RPMs (000,000) "traffic" |  | 49,781 | 48,236 | 33,489 | 30,340 | 27,778 |
| Mainline: | ASMs (000,000) "capacity" |  | 59,187 | 56,945 | 39,473 | 35,912 | 32,430 |
| Mainline: | Load factor |  | 84.1% | 84.7% | 84.8% | 84.5% | 85.7% |
| Mainline: | Yield |  | 13.01¢ | 13.02¢ | 13.18¢ | 12.98¢ | 13.58¢ |
| Mainline: | CASMex (c) |  | 7.73¢ | 7.50¢ | 7.39¢ | 7.39¢ | 7.45¢ |
| Regional (b) : | Revenue passengers (000) |  | 10,199 | 9,495 | 9,452 | 9,015 | 8,306 |
| Regional (b) : | RPMs (000,000) "traffic" |  | 4,892 | 4,101 | 3,720 | 3,238 | 2,940 |
| Regional (b) : | ASMs (000,000) "capacity" |  | 6,148 | 5,127 | 4,662 | 4,002 | 3,648 |
| Regional (b) : | Load factor |  | 79.6% | 80.0% | 79.8% | 80.9% | 80.6% |
| Regional (b) : | Yield |  | 23.66¢ | 24.96¢ | 26.26¢ | 26.37¢ | 27.40¢ |
Question:
What is Alaska Airline's Revenue Passenger Miles or 'traffic' for the Mainline in 2018?
Answer:
49,781