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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.

There are numerous joint use (commercial/military) airports with separate terminals/ramp areas, there aren't many where there are two connected fields. The only one I'm aware of is Naval Air Station Whiting Field near Milton FL that has two operational fields with separate identifiers.

There is NAS Whiting Field - North. ICAO: KNSE and

NAS Whiting Field - South. ICAO: KNDZ

The two fields have a central support base area between the two fields. There is a single taxiway that connects the two fields around the east side of the support area.

TPE is connected by a taxiway to the military airport just SE of it.

Oakland International Airport (IATA: OAK, ICAO: KOAK, FAA LID: OAK) is an international airport in Oakland, California, United States.

Oakland International Airport covers 2,600 acres (1,100 ha) and has four runways.

OAK has in essence, two independent operations running as one complex. Commercial flights and cargo operations operate primarily out of the South field complex.

South Field (Commercial and cargo operations) (one runway):

• Runway 12/30: 10,520 ft × 150 ft (3,206 m × 46 m) asphalt

North Field (general aviation operations) (three runways):

• Runway 10R/28L: 6,213 ft × 150 ft (1,894 m × 46 m) asphalt




• Runway 10L/28R: 5,458 ft × 150 ft (1,664 m × 46 m) asphalt




• Runway 15/33: 3,376 ft × 75 ft (1,029 m × 23 m) asphalt

There is a connecting taxiway that will take you from the middle of 12/30 to 28L, over the Ron Cowan Parkway, but my experience is that no commercial flights use the North Field.

https://en.wikipedia.org/wiki/Oakland_International_Airport

One possibility may be a joint use military and civilian airport such as Charleston AFB / Charleston Intl. Airport (KCHS) in Charleston, SC. However both are located on the same facility just making use of separate areas. But two separate airports linked by a single taxiway. I don’t know of one