A Mexican businessman linked to the company whose jet crashed near Monterrey, Mexico on Sunday, killing star singer Jenni Rivera, 43, and six other people, has been convicted of falsifying aircraft records, counterfeiting government inspection stamps, and drug-trafficking charges, court records show.   The businessman, Christian E. Esquino Nuñez, also owes millions in state and federal taxes and even an undisclosed amount to the norteño band Los Tigres del Norte, according to state and court records examined by Univision News.   Now Esquino Nuñez may also have to field questions from Mexican authorities and investigators from the National Transportation and Safety Board (NTSB) who are looking into what caused the crash.The NTSB has sent a team to Mexico to help the Mexican government in the investigation.

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