Thanks for the replies. All very helpful!

So given all tickets are separately purchased on different carriers I can forgo my connecting flight to LA and purchase a different flight to Houston. I just need to get a ‘short check’. I’m still not sure if they do this but I’ll try and find out. Most of the help on the site is not in English and I need to make an international call to an English speaker which is proving difficult. Do I let interjet know I’m not getting on the connecting flight or do I just ask for a short check?