Yes, your observations are correct

There is a good bit of cargo from other cities that is also trucked into & consolidated at GSO on the weekends (ie --- there is no longer an RDU-MEM flight on Sundays, as that freight moves thru GSO)

I believe there is also a relatively large FEDEX ground hub in nearby Kernersville, NC --- and some inbound/outbound GSO freight moves between these two facilities, which may not be transparent to everyone

In total, I believe there are 8 operational aircraft gates --- though they are rarely (if ever) full