<font face="Verdana, Arial, Helvetica, sans-serif" size="2">I'm sure, but in brief - they say you cannot intentionally start a second trip before completing the first if the destinations are the same.</font>
Is UA better off when you use another airline for the nested trip? Or back to back. In many markets, such as, DTW-ORD you can choose from 5 carriers.
Fossilized ageing corporations are paralyzed and die of hunger when their cheese has moved.