Air travelers could be on the hook to cover 20 to 29 percent higher costs if the U.S. moves to a private air traffic control (ATC) organization funded through “user fees,” according to a new study released Monday by Delta Air Lines. The study — a compilation of data from various independent reports — reviewed the ATC fees associated with a privatized model in Canada and the United Kingdom and found that after the first six years of privatization, Canada saw an additional 59% increase on ATC-related fees. In the United Kingdom, ATC fees rose 30%. Delta’s Senior Vice President, Flight Operations, Capt. Steve Dickson, even went so far as to write an op-ed in USA Today warning consumers of the added costs. To read his editorial, click here.