I haven’t any experience with IC.
With Seaborne whether you check in your luggage or carry on they will give you the bags when you deplane at EIS and it won’t be necessary to collect your bags at the baggage claim.
I assume this would be true for IC at EIS also. But to clarify, I meant anyone arriving on our Southwest flight (who checked a bag) into SJU would need to get their bags from baggage claim and return to ticketing counter to check in.
