On January 28, 1972, Trapnell, using a.45 caliber pistol he had smuggled aboard inside a plaster cast on his arm, hijacked TWA Flight #2 on a flight from Los Angeles to New York while over Chicago. Trapnell demanded $306,800 in cash, the release of Angela Davis, and a formal pardon from President Richard Nixon. The FBI was able to retake the aircraft during a crew switch at Kennedy Airport; Trapnell was shot and wounded, no one else was hurt. Trapnell's skyjacking came after a string of similar domestic incidents and was directly responsible for an overhaul of security procedures by the Federal Aviation Administration that remained in place until the September 11 attacks almost 30 years later. At trial, he once again pleaded insanity, claiming that he suffered from multiple personality disorder and schizophrenia and that the hijacking was actually committed by an alter ego named "Greg Ross." This position was discredited when the prosecution produced a video tape of Trapnell, recorded months before the hijacking, in which he had boasted to a journalist of his skill at faking insanity. Nevertheless, the trial still ended in a hung jury when a lone juror held out for acquittal. At his retrial four months later, however, he was convicted and sentenced to life imprisonment. His subsequent incarceration at USP Marion, the first federal supermax prison, was marked by continued scheming and criminal endeavour.
Attempted breakouts
On May 24, 1978 his friend, 43-year-old Barbara Ann Oswald, hijacked a St. Louis-based charter helicopter and forced the pilot to land in the yard at USP Marion, where Trapnell was serving his sentence. While landing the aircraft the pilot, Allen Barklage, who was a Vietnam veteran, struggled with Oswald and managed to wrestle the gun away from her. Barklage then shot and killed Oswald, thwarting the escape. In addition to Trapnell, another inmate involved in the escape was Martin J. McNally, who had hijacked a St. Louis-Tulsa American Airlines Flight on June 23, 1972 and demanded $502,500 before jumping out of a Boeing 727 over Peru, Indiana. Barklage died in a helicopter crash on September 19, 1998, succumbing to his wounds on September 25, and McNally was paroled on January 27, 2010. According to Eddie G. Griffin, an author, former member of the Black Panther Party, and convicted bank robber who was incarcerated at Marion at the time, Trapnell was placed under a "no human contact" order following the attempted escape and spent most of the remainder of his life in solitary confinement. On December 21, 1978 Robin Oswald, the 17-year-old child of Barbara Ann Oswald, hijacked TWA Flight 541 and demanded that Trapnell be freed or she would detonate dynamite that was strapped to her body. Robin Oswald was remembered by the hostages aboard the flight as a "beautiful girl" with a serious demeanor, who never exhibited any signs of nervousness. FBI negotiators were able to free the passengers and induce her to surrender with no injuries or deaths. The bomb that was strapped to her chest later emerged to be a set of railroad flares wired to what appeared to be a doorbell. Robin Oswald was charged as a juvenile with charges not being announced as is the law in Illinois.
