< PrevNext > 6. PWC London Share 2019 U.S.-Booked Air Volume: $325 millionPrimary U.S. Online Booking Tool: ConcurPrimary U.S. Payment Supplier: American ExpressConsolidated U.S. TMC: Amex GBTBTN estimates that Big Four accounting firm and professional services giant PricewaterhouseCoopers in 2019 slightly increased its U.S.-booked air volume year over year.PwC's business air travel during its 2019 fiscal year, which ended June 30, 2019, generated about 505,000 metric tons of carbon dioxide equivalent, up from about 427,000 in the prior 12 months. The company has committed to offsetting those FY2019 emissions by its 2022 fiscal year.The company uses Concur Travel for online booking in the United States, but uses Amex GBT's KDS in some other global markets. PwC during 2019 in some markets deployed a new hotel payment program centered around the use of virtual Conferma cards. PwC during its fiscal 2019 earned $42.4 billion in revenue, a 7 percent year-over-year increased based on continuing operations. The company had about 276,000 employees at the end of June 2019, up 10 percent from the year prior.