In 2002, there were 1,165 km (724 mi) of highways, of which 384 km (239 mi) were paved. In 1995, there were 302 motor vehicles per 1,000 population. The railway consists of 77 km (48 mi) of narrow-gauge track, used mainly to haul sugar cane. The islands have no natural deep water harbors; a deep water facility was constructed at St. John's in 1968. The merchant fleet in 2002 consisted of 762 ships (1,000 GRT or over), totaling 4,541,940 GRT. In 2001, there were a total of 3 airports, 2 of which had paved runways. Vere Cornwall Bird International Airport, 7 km (4 mi) northeast of St. John's, accommodates the largest jet aircraft; Coolidge Airport, also on Antigua, handles freight. There is also a landing strip at Codrington. Domestic and international scheduled flights carried 1,369,100 passengers in 2001.