Here are four flights from San Francisco to Beijing every day.
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Two of them are scheduled to land at 3:30 pm which could be 3:15 if they were early
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Same two land at Terminal E but different gates.
Unfortunately, found this search results page and am not able to get other dates for comparison.
https://www.bing.com/search?q=flights%20from%20san%20francisco%20to%20bejing%20Jan%2011%202019&qs=n&form=QBRE&sp=-1&pq=flights%20from%20san%20francisco%20to%20bejing%20jan%2011%202019&sc=0-48&sk=&cvid=E979B37AF7F44E08A60131E7E995DB46