Originally Posted by
UAinAUS
4) Many were delivered as 175LLs which is the factory-built 70-seat version, but about 1/3rd were 175ERs later converted to LL's. To be more confusing SOME LLs were officially FAA-upgraded to ERs, but others were not. United uses 175SC (SC for scope compliant) for the 70-seat model whether ER or LL version. There is no practical difference between them.
Thanks! This is more for my flight tracking on MyFlightRadar24. The only options they have are generic ERJ-175, E175S, and E175L. I have been logging all the UA flights under the third option, but I wanted to make sure I was not missing something given the plane classification.