If you go to
https://sites.google.com/site/united...fleet-tracking, go to the 752 lab and click on the tail number, you can see the last weeks for each frame (more if you signup for a free flightaware account)
Such as
https://flightaware.com/live/flight/N58101 did a ORD-DUB run today -- has recent done KEF, EDI, ARN, .. OPO is also at stop
some EWR tanscon to LAX and SEA and BOS_SFO, ....
EWR-MCO
other routes include DEN-HNL/KOA/LIH
A little of this, a little of that
try some of the links