| Revenue from operations | 5,814.81a | 5,866.15a | 6,260.08a |
| Operating expenses | — | — | — |
| Salaries, wages and benefits | -2,689.31a | -2,629.68a | -2,716.84a |
| Operating supplies and expenses | -635.32a | -718.33a | -852.96a |
| General supplies and expenses | -176.55a | -162.42a | -160a |
| Operating taxes and licenses | -144.69a | -145.64a | -141.24a |
| Insurance and claims | -92.36a | -75.37a | -58.3a |
| Communications and utilities | -40.83a | -43.27a | -40.58a |
| Depreciation and amortization | -344.57a | -324.44a | -276.05a |
| Purchased transportation | -122.82a | -121.52a | -158.11a |
| Miscellaneous expenses, net | -24.37a | -4.83a | -15.37a |
| Total operating expenses | -4,270.81a | -4,225.48a | -4,419.45a |
| Operating income | 1,544a | 1,640.67a | 1,840.63a |
| Non-operating (income) expense | — | — | — |
| Interest expense | -0.21a | -0.46a | -1.56a |
| Interest income | -17.01a | -12.8a | -4.88a |
| Other expense, net | -3.2a | -5.23a | -2.6a |
| Total non-operating income | -13.6a | -7.1a | -0.72a |
| Income before income taxes | 1,557.6a | 1,647.78a | 1,841.35a |
| Provision for income taxes | -371.52a | -408.27a | -464.19a |
| Net income | 1,186.07a | 1,239.5a | 1,377.16a |