Coimbatore-based Air Carnival has received an air operator permit from the DGCA, becoming the country’s fourth regional airline. The airline has started operations on four routes – Coimbatore-Chennai, Chennai-Madurai, Madurai-Chennai and Chennai-Coimbatore. Ithas plans to expand operations to Tirupati, Hubli, Visakhapatnam, Rajahmundry and Mangaluru.