What’s going to stop that?” said Jon Loffi, a longtime law enforcement officer who teaches aviation security at Oklahoma State University and wrote a paper on identifying insider threats. The Federal Aviation Administration says its approved medical examiners are trained to gauge a pilot's mental health. The Horizon close call could result in the re-examination of the practice of letting off-duty pilots or other airline employees sit in the cockpit jump seat. Security experts say it would be difficult if not impossible to stop every determined criminal or terrorist who targets aviation. The off-duty Alaska Airlines pilot who was arrested Sunday joined Horizon as a first officer or co-pilot in 2001.

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Persons: We’re, ”, Jon Loffi, It's, Joseph David Emerson, Emerson, Jeffrey Price, “, Ross Aimer, ” Price, ” Loffi, Loffi, Pete Buttigieg, Karen Yee, ” Allen Scott, ___ Claire Rush Organizations: Alaska Airlines, Oklahoma State University, FAA, FBI, Federal Aviation Administration, Metropolitan State University of Denver, Oklahoma State, FedEx, Pacific Southwest Airlines, Security, Transportation Security Administration, Sunday, Virgin America, Mercury, San Francisco Chronicle Locations: U.S, Oklahoma, French, California, Alaska, Multnomah County , Oregon, Portland, Pleasant Hill , California, San Francisco, Jose, Portland , Oregon