In the UK, the airports I have seen have bike racks outdoors. London Standsted always has a full bike rack or two.

However, most airports in the EU have a direct train/bus to the terminal ... so it's not essential to use a car/bike.

They'll have bike parking at the train/bus station, such as here:



I don't know what anyone would build an airport with bike parking and not have bike parking at all transit forms to the airport. They're usually major employers in the area.