Table 19. Systemwide Available Seat-Miles (ASMs) on U.S. Airlines, Unadjusted, September 2017, December 2017 [1]
Systemwide (Domestic + International) ASMs (unadjusted) in billions (000,000,000), Scheduled service only
| 2014 | 2015 | 2016 | 2017 | |
|---|---|---|---|---|
| January | 79.8 | 83.4 | 86.3 | 90.0 |
| February | 72.5 | 74.5 | 82.0 | 81.4 |
| March | 88.2 | 90.3 | 94.2 | 96.8 |
| April | 84.8 | 88.6 | 91.6 | 94.8 |
| May | 88.5 | 92.8 | 96.4 | 99.5 |
| June | 92.0 | 95.7 | 99.9 | 103.7 |
| July | 96.5 | 101.0 | 104.4 | 108.6 |
| August | 94.0 | 98.6 | 101.8 | 105.8 |
| September | 83.5 | 87.3 | 90.4 | 91.4 |
| October | 86.1 | 89.5 | 92.2 | 96.4 |
| November | 81.7 | 84.9 | 86.9 | 90.3 |
| December | 86.8 | 90.3 | 93.0 | 96.2 |
| Yr. Total | 1,034.4 | 1,076.9 | 1,119.1 | 1,154.9 |
Notes:
Available seat-miles are a measure of the capacity of air passenger transportation. An available seat-mile is equal to one aircraft seat carried one mile.
Source:
Bureau of Transportation Statistics, T-100 Segment