Originally Posted by Often1

Not reality. OP points out that his wife is on separate PNR's. She's not flying two segments and checking in at ORD through to ROC with a connection at LGA. She's flying two separate itineraries. While UA and US certainly interline, that doesn't as others point out, deal with the separate PNR issue which takes a sophisticated UA agent at ORD (not an Airserv contractor) to figure out. Also, the 45 MCT for LGA is way too short given the realities of the system (mini-van between terminals). While it's a legal connection, it's tight unless one is familiar with both terminals.