On September 10, 1976, she, her husband, and three others hijacked domestic Trans World Airlines flight 355 departing from New York for Chicago, using the threat of a bomb. While refueling the hijacked plane at Montreal's Mirabel International Airport, they told officials that they had planted a bomb in a locker at Grand Central Terminal and gave them instructions on finding it. They demanded that an appeal to the American people concerning Croatia's independence be printed in the "New York Times", the "Washington Post", the "Chicago Tribune", the "Los Angeles Times", and the "International Herald Tribune". The plane was then flown to Gander, Newfoundland, where 35 of its passengers were released. From there the plane was accompanied by a larger TWA plane that guided it to Keflavík, Iceland. The hijackers' initial European destination was London, but the British government refused them permission to land.