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Austin-Bergstrom International Airport is reporting some of the busiest days in the airport's history this month as travelers converged on the city for the South By Southwest festival that wrapped up yesterday. March 10th was the second busiest day ever. March 13th was the third busiest day. Both days had more than 36-thousand travelers. The busiest day ever at the airport was last October, on the Monday after the United States Grand Prix Formula 1 race, when more than 43-thousand travelers went through the airport. Officials are expecting Austin's airport to remain busy this week, as NASCAR fans converge on the city for this coming weekend's race at Circuit of the Americas.