2018 U.S.-Booked Air Volume: $55 million
After ticking down $2 million in 2017, medical device and equipment maker Stryker's U.S.-booked air volume reversed that decline in 2018, jumping back up $3 million to $55 million. The firm has spent billions on acquisitions over the past several years, and that investment has led to significant growth in the company's headcount to more than 36,000 employees as of the end of 2018, an increase of 10,000 since 2015. U.S.-booked air volume has tracked that growth, ballooning by more than $9 million over the same period.