Originally Posted by
seaskybound
When doing an EU turnaround like the OP is doing. does BA have total IRROP responsibility, in this case to get you to JFK/SFO (as the LHR-BRU sector is a different ticket than the BRU-LHR sector)
If the two segments are on different tickets then BA have no responsibility if something goes wrong. However the logic goes that if you are on the plane that is supposed to be heading back and you have checked in online, then in theory, you shouldn't get in to a mess.
The one situation where this doesn't hold true is if BA decide to use a different plane because the outward plane is delayed.