Airlines for America (A4A), the trade group which represents the U.S. airlines also support the breakup. But this comes at no surprise, as the airlines would love to break off from the FAA as the agency has a zero tolerance for the airline culture of passenger abuse (Tarmac rule, Passenger Bill of Rights, etc.) However, Delta Airlines has come out to appose the breakup of ATC from the FAA. 

Delta Airlines - "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 (The Costs Of Privatizing Air Traffic Control And How It Will Impact Airline Travelers) by Delta Air Lines. 

“Proponents have claimed that privatization would lead to cost savings for consumers,” the study stated. “But no evidence has yet been produced to show that privatization would reduce costs. In fact, nations that have privatized ATC have seen operational costs increase at a much higher rate than has been seen in the US under the FAA.”

"The study, which is 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 percent increase on ATC-related fees. In the United Kingdom, ATC fees rose 30 percent. The study also included examples of extreme tax increases, and outlined how a privatized, revenue-based system could result in ATC resources being prioritized at larger airports to raise greater revenue, to the detriment of smaller regional airports across the country.

"Delta has long held that removing the Air Traffic Organization, which provides air navigation services across the U.S., out from under FAA’s safety oversight is a bad idea for several reasons. Capt. Steve Dickson, Senior Vice President – Flight Operation"

A4A, CEO Nicholas Calio said an inefficient system costs airlines and their customers $30 billion annually in delays. “We applaud the hard and diligent work the committee has done to produce a bill that could accomplish for the national airspace system what others have only talked about for years, putting it at the forefront of aviation technology and innovation.”

Aircraft Owners and Pilots Association (AOPA) President Mark Baker said that AOPA supports the legislative changes on third class medical certification for general aviation pilots. However, AOPA does not support the plan to separate air traffic control from the FAA.

Rep. Bill Shuster (R-Pa.) said “I believe by separating air traffic control into an independent ... corporation and leaving behind the regulatory, the safety aspect, in government, is something we need to do". Shuster referring to the FAA "I do not believe they are suited (to be) a high-tech service provider for the airlines and the traveling public.”

When asked what a corporation can do that the FAA cannot do, Shuster said “They can go to the markets and borrow dollars and issue bonds to get the dollars necessary, based on their cash flow, not based on an appropriations cycle, to go forward and make the investments (necessary) for the long term. Operating outside of the government, they’re going to be outside of this political pressure; if they want to change, modify, reform, consolidate different aspects of this organization, they will be able to do it.”

Experimental Aircraft Association (EAA), CEO and chairman, Jack J. Pelton said “EAA supports a stable, predictable funding mechanism for the national airspace system, but we oppose this bill as it is now written".

“To be fair, there are some good things in the bill for general aviation, which the bill’s co-sponsors say address GA concerns, especially the prohibition of user fees, the reintroduction of aeromedical reform as originally intended, certification reform, and additional FAA authority to help deploy a future high-octane unleaded fuel.

“What is also part of the bill, however, is an ATC governance structure that heavily favors airlines and commercial interests, and creates real threats to the services that keep America’s air traffic system the safest and most effective in the world.

"ATC privatization carries the real possibility of putting GA in the ‘big squeeze’ regarding fees, services, airport access, and the individual freedom to fly for grassroots and recreational flying.”

In January Senator's Thad Cochran, Barbara Mikuiski, Susan M. Collins and Kack Reed wrote, a letter of opposition of the FAA being stripped of its authority to oversee the FAA. "We are writing to express our opposition to legislation that would separate the air traffic control function of the Federal Aviation Administration (FAA) from the rest of the agency and remove that function from the congressional appropriations process....... It does not make sense to break apart the FAA, an essential put of our success in aviation.... Furthermore, the public would not be well served by exempting any part of the FAA from annual congressional oversight."