Former Korean Air Lines executive Heather Cho (C) is surround by reporters as she is released at a courthouse in Seoul, South Korea, May 22, 2015.[Photo/Agencies]

SEOUL, South Korea - A South Korean court Friday suspended the prison term of the former Korean Air executive whose onboard "nut rage" tantrum delayed a flight last year, immediately ending her incarceration.

Cho Hyun-ah, who is the daughter of the airline's chairman, did not violate aviation security law when she ordered the chief flight attendant off a Dec 5 flight, forcing it to return to the gate at John F. Kennedy Airport in New York, according to the Seoul High Court.

The upper court sentenced Cho to 10 months in prison and then suspended the sentence for two years. It said she was guilty of assault. A lower court had earlier sentenced Cho to a year in prison. She has been locked up since her December arrest.

Cho achieved worldwide notoriety after an onboard tantrum triggered when a first class flight attendant served her macadamia nuts in a bag instead of on a dish. Cho, head of the airline's cabin service at the time, had a heated, physical confrontation with members of the crew.

Swarmed by reporters at the court, she made no comment in front of the TV cameras, bowing her head and burying her face in her hands as the media pressed in and yelled for her to say something.

The incident was a lightning rod for anger in a country where the economy is dominated by family-run conglomerates known as chaebol that often act above the law.

"If she was released because she showed repentance, other criminals should be equally released," said 19-year-old college student Kim Ryeong-hui. "I think the court went easy on her. I feel angry when people mistreat other people in lower ranks."