David Henderson, 66, admitted committing an illegal act, according to the British news agency BA Media.
Henderson pleaded guilty to the charges after he requested to appear in court on Monday, the eve of his trial at Cardiff Crown Court.
Henderson is appearing in court after being accused of endangering the safety of the plane.
A jury of 7 men and 5 women was chosen to hear the case after initially asserting that they were not Cardiff City fans, or used to attend football matches regularly.
It is noteworthy that the plane carrying Argentine footballer Sala, 28, to Wales from France, after he signed to join Cardiff, disappeared from radar screens while crossing the English Channel on January 21, 2019.
And Cardiff City, who were competing in the English Premier League, signed Sala, the French striker from Nantes, for 15 million pounds (19 million dollars), in a record deal for the Welsh club.
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