The airport system of Milano is well connected with the rest of the world.
The city has three airports:
Milano Linate, LIN
Milano Malpensa, MXP
Bergamo Orio al Serio, BGY(mainly used by low cost arline companies)
All of them are well connected to the city within one hour by train/bus.
The most important International Airport in northern Italy, is located 48 Km north-west of Milan and can be easily reached by public transportion:
Malpensa Express train www.malpensaexpress.it > connections to/from Milan Central Station and Piazza Cadorna Station every 30 minutes in both directions.
Malpensa Shuttle bus www.malpensashuttle.it > connections to/from Milan Central Station every 20 minutes in both directions.
It is located just 7 km from Milan city centre and it is connected to Milan City by ATM bus n.73 www.atm-mi.it, one every 10 minutes to/from Piazza San Babila.
BERGAMO ORIO AL SERIO
It is located 45 km from Milan city center and it is connected by Orio Shuttle bus www.orioshuttle.com to/from Milan Central Station, one every 30 minutes in both directions.
Furthermore a modern train system www.trenitalia.it connects Milano to several European cities: there are direct trains to Marseille, Lyon, Paris, Geneva, Basel, Zürich, Münich, Wien and additional connections are available.