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, |
| --- | --- | --- | --- | --- | --- | --- |
|  |  | 2018 | 2017 | 2016 | 2015 | 2014 |
|  |  |  | As Recast | As Recast | As Recast (k) | As Recast (k) |
| Financial Data (in millions, except per share amounts): | Operating revenues | $21,965 | $21,146 | $20,289 | $19,820 | $18,605 |
| Financial Data (in millions, except per share amounts): | Operating expenses | 18,759 | 17,739 | 16,767 | 15,821 | 16,437 |
| Financial Data (in millions, except per share amounts): | Operating income | 3,206 | 3,407 | 3,522 | 3,999 | 2,168 |
| Financial Data (in millions, except per share amounts): | Other expenses (income) net | 42 | 142 | 72 | 520 | 352 |
| Financial Data (in millions, except per share amounts): | Income before taxes | 3,164 | 3,265 | 3,450 | 3,479 | 1,816 |
| Financial Data (in millions, except per share amounts): | Provision for income taxes | 699 | (92) | 1,267 | 1,298 | 680 |
| Financial Data (in millions, except per share amounts): | Net income | $2,465 | $3,357 | $2,183 | $2,181 | $1,136 |
| Financial Data (in millions, except per share amounts): | Net income per share, basic | $4.30 | $5.58 | $3.48 | $3.30 | $1.65 |
| Financial Data (in millions, except per share amounts): | Net income per share, diluted | $4.29 | $5.57 | $3.45 | $3.27 | $1.64 |
| Financial Data (in millions, except per share amounts): | Cash dividends per common share | $0.6050 | $0.4750 | $0.3750 | $0.2850 | $0.2200 |
| Financial Data (in millions, except per share amounts): | Total assets at period-end | $26,243 | $25,110 | $23,286 | $21,312 | $19,723 |
| Financial Data (in millions, except per share amounts): | Long-term obligations at period-end | $2,771 | $3,320 | $2,821 | $2,541 | $2,434 |
| Financial Data (in millions, except per share amounts): | Stockholders’ equity at period-end | $9,853 | $9,641 | $7,784 | $7,358 | $6,775 |
| Operating Data: | Revenue passengers carried | 134,890,243 | 130,256,190 | 124,719,765 | 118,171,211 | 110,496,912 |
| Operating Data: | Enplaned passengers | 163,605,833 | 157,677,218 | 151,740,357 | 144,574,882 | 135,767,188 |
| Operating Data: | Revenue passenger miles (RPMs) (000s) (a) | 133,322,322 | 129,041,420 | 124,797,986 | 117,499,879 | 108,035,133 |
| Operating Data: | Available seat miles (ASMs) (000s) (b) | 159,795,153 | 153,811,072 | 148,522,051 | 140,501,409 | 131,003,957 |
| Operating Data: | Load factor (c) | 83.4% | 83.9% | 84.0% | 83.6% | 82.5% |
| Operating Data: | Average length of passenger haul (miles) | 988 | 991 | 1,001 | 994 | 978 |
| Operating Data: | Average aircraft stage length (miles) | 757 | 754 | 760 | 750 | 721 |
| Operating Data: | Trips flown | 1,375,030 | 1,347,893 | 1,311,149 | 1,267,358 | 1,255,502 |
| Operating Data: | Seats flown (d) | 207,223,050 | 200,878,967 | 193,167,695 | 184,955,094 | 179,733,055 |
| Operating Data: | Seats per trip (e) | 150.70 | 149.03 | 147.33 | 145.94 | 143.16 |
| Operating Data: | Average passenger fare | $151.64 | $151.73 | $152.89 | $154.85 | $159.80 |
| Operating Data: | Passenger revenue yield per RPM (cents) (f) | 15.34 | 15.32 | 15.28 | 15.57 | 16.34 |
| Operating Data: | Operating revenue per ASM (cents) (g)(j) | 13.75 | 13.75 | 13.66 | 13.98 | 14.20 |
| Operating Data: | Passenger revenue per ASM (cents) (h) | 12.80 | 12.85 | 12.84 | 13.02 | 13.48 |
| Operating Data: | Operating expenses per ASM (cents) (i) | 11.74 | 11.53 | 11.29 | 11.26 | 12.55 |
| Operating Data: | Operating expenses per ASM, excluding fuel (cents) | 8.85 | 8.88 | 8.73 | 8.60 | 8.46 |
| Operating Data: | Operating expenses per ASM, excluding fuel and profitsharing (cents) | 8.51 | 8.53 | 8.34 | 8.16 | 8.19 |
| Operating Data: | Fuel costs per gallon, including fuel tax | $2.20 | $1.99 | $1.90 | $1.96 | $2.97 |
| Operating Data: | Fuel costs per gallon, including fuel tax, economic | $2.20 | $2.06 | $2.00 | $2.13 | $2.95 |
| Operating Data: | Fuel consumed, in gallons (millions) | 2,094 | 2,045 | 1,996 | 1,901 | 1,801 |
| Operating Data: | Active fulltime equivalent Employees | 58,803 | 56,110 | 53,536 | 49,583 | 46,278 |
| Operating Data: | Aircraft at end of period | 750 | 706 | 723 | 704 | 665 |
Question:
How much was the capacity of Southwest Airlines in year 2015?
Answer:
140,501,409