Orio al Serio Airport is 5 km from Bergamo and 45km from Milan, yet it is billed as Milan over Bergamo.
[Ryanair Orio al Serio Destinations]
Ryanair and the other low cost airlines that serve it call it Milan, and even the Orio al Serio official website calls it Milan Orio al Serio airport. This seems like a shame for Bergamo because it is a destination in its own right.