First off I do not check bags, if that matters on a domestic USA flt. I do not think it does.
Second, I am usually called to go to another city for a major problem within my company. I leave one plane, buy a new ticket and board the other flight.
I am already past the TSA - so I am cleared to board whatever flt I want to board. What is the problem?
This happens many times. I have offices all over the USA. If I am flying LAS-DEN who cares if I get off and fly to SFO?