Hi, am flying longhaul with DS in December with BA and would appreciate advice re strollers vs travel system. I am traveling alone with him, he will be 4.5 months but is a big boy so too heavy for sling all the time and have 2 connections, plus woukd like him to sleep at some point and he wont in the sling. Does anyone know if you can take a heavier style travel system buggy to the gate or if it must be checked with luggage? If need be I would buy a maclaren stroller to use and leave travel system buggy at home and check car seat. Advice / suggestions appreciated, many thanks!