Airport infrastructure sits within Transportation & Logistics, moving everything else on this list — the connective tissue of physical trade, a category with a real, though adjacent, scale: $417B/year in transport investment needed through 2030 in lower- and middle-income countries alone; transport reaches up to 12% of GDP in many of those economies and employs roughly 200 million people worldwide — not a single global market-size figure (World Bank). Airport infrastructure is one of 10 of the category's 20 items directly backed by UNCTADstat, IATA, OICA, UIC RAILISA, IMF PortWatch, EIA, World Bank trade data, and ICAO, rather than an editorial judgment call.
Airport infrastructure is 1 of 20 items in Transportation & Logistics. See the full ranked list, or browse all 20 Human Endeavors categories.