WE’VE DISCUSSED THESE PROBLEMS BEFORE: How a Series of Air Traffic Control Lapses Nearly Killed 131 People.

One of the FedEx pilots commandeered the air traffic control radio frequency. He ordered Southwest to abort its takeoff. It didn’t. The FedEx crew blasted the engines to climb away from the Southwest plane. “On the go,” a FedEx pilot radioed.

The FedEx plane, which had three crew members, skimmed less than 100 feet over the other jet. The 128 people aboard Southwest Flight 708 continued on their way to Cancún, Mexico. Passengers were unaware that they had nearly died.

In a year filled with close calls involving U.S. airlines, this was the one that most unnerved federal aviation officials: A disaster had barely been averted, and multiple layers of the vaunted U.S. air-safety system had failed.

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