I'm trying to get a price for a multi-stop trip as below but keep getting the error "Something went wrong. Our system is having trouble. Please try again or come back later.". I have tried it on Delta and this worked, a leg at a time. I fancy I might be able to get a cheaper overall price than booking the internal flights separately, which is what we have done in the past. I have tried various options (eg just one passenger, not selecting class of travel - the two of us would be travelling in Business/First). Is there anyway to get this to work? Travel would be within 6 weeks from start at MAD to return to MAD. Any advice welcome. Calling AA would not give me the option to dwell over the various flight options.

MAD-CLE, SEA-LAS, LAS-IAH, IAH-MAD

Thank you!