If LAX was just a stop and you want to reroute to a destination in a more direct manner, that is not an unreasonable request and worth raising with UA.
However if LAX was the destination and there was a separate ticket to get to DTW, that is going be more difficult. How late is the arrival into LAX?
So without understanding the full trip routing, this is hard to answer.
Last edited by WineCountryUA; Nov 30, 2019 at 10:30 am