< PrevNext > 56. Koch Wichita, Kan. Share 2018 U.S.-Booked Air Volume: $76.7 millionPrimary U.S. Online Booking Tool: ConcurPrimary U.S. Expense Supplier: ConcurConsolidated Global TMC: CWTBTN estimates that privately held conglomerate Koch boosted U.S.-booked air volume 6.5 percent in 2018 over its 2017 air spend. The company, which is parent to well-known brands like paper and building product manufacturer Georgia-Pacific and fuel and chemical producer Flint Hills Resources, began a venture at the tail end of 2017 investing in startups; Koch Disruptive Technologies' first foray into the space led a $150 million investment in Insightec, an Israeli medical device manufacturer. According to Forbes, Koch revenue reached $110 billion in 2018. Its 2017 global employee count, the most recent available, was 120,000.