I'm sure someone in rec.aviation.misc on Usenet could tell you the arrival times, gratis.
A quick scan of the Google archive of that group reveals the following (from 1997):
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">For quality, not quantity, it's hard to beat Boeing Field in Seattle (not
the same as SeaTac Airport). Not much passenger traffic, but between 5 &
7 p.m. the sky is sometimes full of UPS and Fed Ex cargo jets.</font>