Mauritius had an estimated 1,860 km (1,156 mi) of roads in 2002, of which 1,786 km (1,109 mi) were paved. As of 2000, there were 28,200 commercial vehicles and 77,000 private passenger cars. The 8 merchant ships in service had a combined capacity of 66,004 GRT in 2001. In 1999 the Port Louis harbor completed a major expansion and modernization. Also in 2001 there were five airports, only two of which had paved runways. Air Mauritius provides about four flights weekly to Rodrigues from the main airport at Plaisance, as well as, over 40 weekly international flights. In early 2001 Air Mauritius concluded an alliance with Delta Airlines. Other major airlines serving Mauritius are Air France, British Airways, Air India, Air Zimbabwe, Lufthansa (Condor), Singapore Airlines and South African Airways. In 2001, 996,500 passengers were carried on scheduled domestic and international flights.