Originally Posted by
leftysauce
yes but only after you depart MBJ (i.e. flight status is "Departed" after the door closes). Or you can ask the Agent on Demand nicely
This will be dependent on whether there are checked bags are not.
if checked bags, SDC will be disabled in app, and OP will have to wait to talk to an agent in IAH. If no checked bags, should be able to make the switch in-app after boarding MBJ, if space available.