In the airline business, there are two cost factors the airlines can never control: fuel and labor. And as technology improves — and pilot salaries increase — there's been a controversial move lately by the industry to try to amend what's known as part 121 of the Federal Aviation Regulations. That's the federal air regulation that requires air carriers to have two pilots in the cockpit at all times. 

The airlines have been quietly lobbying that the single-pilot approach would quickly solve the staffing problem caused by the pilot shortage and that technology has vastly improved to allow for safe operation of a single-pilot flight. 

There's language in a new bill now introduced in Congress — the Federal Aviation Administration reauthorization bill — asking the Federal Aviation Administration to reconsider part 121 and to allow the use of a single pilot operation, first in cargo aircraft. 

Not surprisingly, airline pilots are loudly protesting this idea, claiming that it would diminish a safety discipline and culture that has been responsible for the safest 25 years in commercial aviation in the history of aviation. Pilots unions argue it's all about the airlines saving money and could compromise safety.

But many recent examples tend to confirm the unions' argument, including a 2015 crash in Europe. A co-pilot of a Germanwings flight locked the pilot out of the cockpit and deliberately crashed the plane, killing himself and 149 other people, giving credence to the ongoing argument that in an airborne crisis you need two pilots working in concert to save the aircraft — as was the case in the "Miracle on the Hudson," when pilots Chesley "Sully" Sullenberger and Jeffrey Skiles successfully ditched a U.S. Airways flight in New York's Hudson River after the plane hit a flock Canada geese on takeoff and subsequently lost power. All 150 passengers as well as the crew were successfully rescued.

And most recently, an incident about 10 days ago occurred on an American Eagle flight from Chicago to Columbus. Shortly after takeoff, the pilot became incapacitated. The co-pilot was able to regain the controls, declare an emergency, turn the plane around and make a safe emergency landing back in O'Hare, and the pilot died later at a hospital. Had there not been a two-person crew in the cockpit, the story would have had a tragic ending. 

In any case, more than 40 countries have appealed to an international aviation agency to revise standards globally to give airlines the option for a one-person cockpit crew, so the fight is just getting started.