Cho Hyun-min, also known as Emily Cho, a senior vice president at Korea's largest airline and the sister of "nut rage" perpetrator, Cho Hyun-ah (Heather Cho) is alleged to have thrown a cup of water at an advertising agency manager late last week.
The flag carrier said Cho, a senior vice president, was suspended from work starting Monday.
Police said the preliminary investigation against Cho has now become a formal criminal case.
The police said they chose to launch an official probe after securing testimony that Cho threw water at a manager of an ad agency in a meeting last month. She later apologized on Facebook, saying the outburst was sparked by her passion for commercials. "It is my big fault that I could not control my emotions".
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Cho's sister, Hyun-ah, achieved worldwide notoriety after delaying a flight at John F. Kennedy Airport over the way nuts were served.
On Saturday, media outlet OhmyNews released a voice recording reportedly of Cho and an employee at Korean Air. Cho is the sister of Cho Hyun-ah, who was jailed in 2014 in the so-called nut rage scandal after she ordered her flight back to an airport gate in NY because she was upset about the way her nuts were served on the plane.
A Korean Air Lines spokesman said the company had yet to be informed of any preliminary investigation.
"There is a huge chance that foreigners who read the news about the founding family's abuse of power would assume that it is part of South Korea's national image", the petition read.
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In a transaction dated April 06, 2018, the shares were put up for sale at an average price of $62.98, raking in a sum of $131,565. Market capitalization is calculated by multiplying a company's shares outstanding by the current market price of one share.
The airline's chairman, Cho Yang-ho, has not commented on the incident involving his younger daughter, who has left the country on a vacation, the company said.
Numerous people who signed a few dozen petitions demanded that the airline remove the word "Korean" from its name and stop using the symbol on the Korean flag as its logo.
Meanwhile, three unions which represent pilots, cabin crew and other workers at the airline have called on Cho to stand down.
"It is a national disgrace that this family keeps making embarrassing troubles while doing business under the "Korea" brand", one petitioner wrote. A Korean Air jet is pictured at O'Hare International Airport on September 19, 2014 in Chicago, Illinois.
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