Are there any 2 (or more) airports that are ground-connected so that e.g. aircraft can taxi between them? Would that be even possible from a definition point of view, having a common area with two airports?
I thought of airport being a facility with an ICAO identifier, but maybe a different definition suits better here?
I could imagine e.g. having an international one and a GA / regional airport being so close together that they were connected at some point. Does anything like that exist?
Update: I'm also curious about airports that are not directly connected in a physical way but e.g. in an operational way: an airside bus takes passengers from the gate in a terminal in airport A and brings them to their flight in airport B or other situations like that.