operates both Trenitalia and LeNord regional trains in Lombardy, carrying over 750,000 passengers on more than 50 routes every day. Buses and trams The city tram network consists of approximately of track and 18 lines, and is Europe's most advanced light rail system. Bus lines cover over . Milan has also taxi services operated by private companies and licensed by the City council of Milan. The city is also a key node for the national road network, being served by all the major highways of Northern Italy. Numerous long-distance bus lines link Milan with many other cities and towns in Lombardy and throughout Italy. Aviation In the surroundings of Milan there are three airports dedicated to normal civilian traffic (Milan-Malpensa Airport and Milan-Linate Airport, managed by SEA, and Bergamo-Orio al Serio Airport by SACBO). Overall, the Milan airport system handles traffic of over 42 million passengers and around 700,000 tons of goods handled every year and is the first in Italy in terms of passenger volume and cargo volume. According to Assaeroporti, the combined figure of the three airports with regard to passengers transported in 2022 is in fact 42,223,435, that of the two Roman airports is 32,836,515; the Milan Malpensa airport, with over 700 thousand tons, confirms the national leadership, processing 70% of the country's air cargo. Malpensa Airport is Italy's second-busiest airport with 21.3 million passengers served in 2022 and Italy's busiest for freight and cargo, handling about 700,000 tons of international freight in 2022. Malpensa airport is 9th in the world and 6th in Europe for the number of countries served with direct scheduled flights l, It lays from downtown Milan and is connected to the city by the Malpensa Express railway service. Linate Airport is Milan's city airport, less than 8 km (5 miles) from central Milan, and is mainly used for domestic and short-haul international flights. It served 7.7 million passengers in 2022 ranking as the 8th airport in Italy for passenger traffic. Linate Airport is Hub of ITA together with Rome Fiumicino airport and is connected to the city center via the M4 blue metro line. Orio al Serio Airport, located some away, near the town of Bergamo, mainly serves the low-cost traffic of Milan and it is the main base of Ryanair (13.1 million passengers served in 2022) ranking as the 3th airport in Italy for passenger traffic. Lastly, Bresso Airfield is a