Table 1.
Descriptive statistics of the quarterly inputs and outputs during 2018–2021
| Variable | Mean | Std. dev | Min | Max |
|---|---|---|---|---|
| The inputs | ||||
| Operating costs (1,000,000 dollars) | 3,195.20 | 2,509.27 | 79.93 | 1,1934.74 |
| Available seat kilometers (million) | 36,506.96 | 26,868.61 | 496.00 | 99,503.00 |
| Available tonne kilometers (million) | 3,832.55 | 2,932.33 | 496.30 | 12,180.63 |
| The desirable outputs | ||||
| Operating revenue (1,000,000 dollars) | 3,209.95 | 2,652.29 | 62.14 | 12,298.49 |
| Revenue passenger kilometers (million passenger-km) | 29,101.73 | 22,863.97 | 167.40 | 85,883.00 |
| Revenue tonne kilometers (million tonne-km) | 2,589.42 | 2,013.99 | 281.90 | 8,631.73 |
| The undesirable output | ||||
| CO2 (1,000,000 tonnes) | 3.44 | 2.74 | 0.08 | 13.01 |