The 3 biggest US airlines are in the middle of a fight to protect their turf from a trio of lavish Middle Eastern carriers

Jeff Smisek United Airlines
Jeff Smisek United Airlines

(REUTERS/Shannon Stapleton)
Former United Airlines CEO Jeff Smisek.

Over the past 15 years, Emirates, Etihad, and Qatar have grown to become three of world's most highly regarded international airlines.

Through a series of agreements between the US government and their respective home nations, the Middle Eastern trio — dubbed the ME3 — have increased their presence in the US market.

However, American, United, and Delta Air Lines — the three biggest US airlines, dubbed the US3— allege that ME3's explosive growth and lavish spending are a result of billions of dollars of unfair government subsidies.

Now the US3 wants the federal government to roll back these agreements that let ME3 encroach on their turf.

This week, that campaign suffered a major setback.

On Tuesday, United's long-time CEO Jeff Smisek resigned amid a federal corruption investigation. His replacement, Oscar Munoz, has better things to do than keep up the fight.

"Munoz will not be well equipped to fight the ME3," Airways News senior business analyst Vinay Bhaskara told Business Insider in an interview. "He will be too busy righting the ship internally."

Munoz seemed to echo this sentiment, telling analysts on a call that he plans to spend his first three months on the job meeting with various groups at United to get a better feel for the company.

He also needs to spend his time hashing out the airline's various labor and technology problems.

These aren't small issues. The airline is embroiled in difficult negotiations with both its flight attendants' and technician's unions that have dragged on for months. Munoz will also have to address the company's notoriously unreliable IT system, which has failed several times over the past few months, causing the planes to be grounded for long periods.

Moreover, the fact that Smisek is leaving under a cloud of allegations that United lavished officials at the Port Authority of New York and New Jersey with dinners and even a special plane route as it sought favors, could mean lawmakers will be far less likely to take up the cause.

The feud is far more than your average business argument, and it boils down this way:

US and international airlines operate globally under a series of "Open Skies" agreements between the US and other nations that aim to free up competition and lessen protectionism. The point is to "expand international passenger and cargo flights by eliminating government interference in commercial airline decisions about routes, capacity and pricing," according to the State Department

united airlines plane
united airlines plane

(Flickr/aero_icarus)
A United Airlines Boeing 747-400.