`=terminal` without `building=` xamples: 
LHR T5  https://www.openstreetmap.org/relation/334919 
CDG T3, separated into arrivals and departures https://www.openstreetmap.org/relation/8473008
NRT T3, it may be asked what's the difference when the bridge is constructed together https://www.openstreetmap.org/relation/8900158 
Bahama, very interesting case of 2 small `building=` separated. Is anyone going to make them separate `=terminal`? https://www.openstreetmap.org/relation/16025827
Honolulu International T1 Concourse B  https://www.openstreetmap.org/relation/14332839 
These are better handled by `=concourse` inside.
