Upvote:3
SFO has multiple terminals with separate secure areas. Since there are multiple exits, they have signed "meeting points" for different gates. The staff assisting will deliver the passenger to that point at least (although most that I've worked with will assist and take the passenger to baggage arrival as well if requested).
I did this about 12 months ago. I met the passenger at the meeting point, and then the three of us went to baggage where the passenger released the wheelchair.
The airline website has a page showing the meeting points here
Image from www.flysfo.com