2018 U.S.-Booked Air Volume: $50 million
After a one-year absence, ubiquitous delivery service UPS makes its return to the BTN 100 for 2018, according to a BTN estimate. That's a $2 million drop-off from the $52 million the company spent on U.S.-booked air spend in 2016. Continued growth in demand for home deliveries, stemming from e-commerce, has driven steady revenue gains for UPS, which earned $71.9 billion in revenue in 2018, about $5.3 billion more than in 2017. The company employed more than 481,000 employees as of year-end 2018, some 399,000 of which were based in the U.S.