Figure 15. Over-the-year employment change in transportation and warehousing, by selected component industries, seasonally adjusted, in thousands, 2017, 2018, and 2019
Industry	2017	2018	2019
Air transportation	13.0	1.1	10.4
Rail transportation	−4.2	4.0	−19.8
Truck transportation	15.7	54.6	4.4
Transit and ground passenger transportation	6.4	1.9	9.7
Support activities for transportation	17.8	39.7	12.3
Couriers and messengers	16.3	72.3	75.7
Warehousing and storage	112.3	80.1	25.3
Source: U.S. Bureau of Labor Statistics.