The court, however, did not pronounce the quantum of punishment as the Rajya Sabha MP, who left the country last month, was not present in the court, Mallya's lawyer H Sudhakar Rao said.
The quantum of punishment is expected to be pronounced on May 5 by the court, GMR lawyer Ashok Reddy said.
"Two cases pertaining to cheque-bouncing were going on against Kingfisher Airlines in the court and the matter was posted for arguments. After the arguments today, the court convicted Mallaya, Kingfisher and a senior official of the airline under section 138 of Negotiable Instruments Act.
GHIAL had in October, 2012, withdrawn a case over 'bounced' cheques against Mallya after the airline agreed to pay the outstanding amount due to the airport operator.
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However, Kingfisher made only a part of the payment and defaulted on the rest, prompting the airport operator to approach the court.
The Ministry of External Affairs recently suspended Mallya's diplomatic passport for a period of 4 weeks on the advice of Enforcement Directorate which two days ago obtained an NBW against him from a Mumbai court in a money-laundering case.