Wow very cool! Is there a way to do it for round trips?
sure its called Rinse and Repeat
so per Dans post lets say the hidden city was FNT(Flint ,Mi) so for the way there t would be LGA-CLE-FNT with you walking away at CLE , you cant do a r/t since you never will be at FNT so for the return do CLE::LGA and find hopefully something from LGA to say BOS and walk away at LGA
most people do an honest tkt to their final destination and only a hidden city for the way back, otherwise you are pushing it by doing 2 hidden citys which if caught and Yes people do get caught at times , its alot harder to justify why your trip had 2 hiddens to hit, alot easier when theres just 1. you would also have to book each as 1 ways which usually but not always will cost more then a r/t.
thats why the hidden city is usally the last segment of the whole trip which was purchased as a r/t, but 2 1 ways at times will price out the same as a r/t so then a person can do 2 1 ways