SFO, e.g., for United Airlines (3)
I believe the answer is:
hub
(Other definitions for hub that I've seen before include "Centre (of network)" , "Focus" , "throbbing heart" , "Centre or axis" , "Centre of activity" .)
I believe the answer is:
hub
(Other definitions for hub that I've seen before include "Centre (of network)" , "Focus" , "throbbing heart" , "Centre or axis" , "Centre of activity" .)