Do you have to take the second leg of a domestic flight?
Say I want to book a flight from Fort Lauderdale to Chicago. Say the airline also flies to St. Louis from Fort Launderdale but has a connecting flight through Chicago. If I book that flights from FLL->ORD->STL and just get off in Chicago, what possible problems can I run into, assuming I didn't check any bags and only have carry on? This scenario exist for Southwest, but I wanted this be more of a general question that would apply to all airlines.