Originally Posted by
Amil
hi im supposed to fly to europe on june 19th from lax-lhr-oslo but the flight from LHR-OSL with BA is cancelled and they currently dont have a flight going on that day. hypothetically if the world somehow gets better by june 19th and I take this flight to london will AA credit me a refund for the portion of the flight that got cancelled?
random sidenote: noticed this was my 420th post. time to light a j lol

Would have been really good timing if you could have reached that milestone a few Mondays ago.
Anyways, I have a difficult time envisioning AA providing a refund for some portion of the amount that you paid just because the LHR-OSL flight was cancelled.
However, you likely have the option to refund the entire itinerary if the earliest that AA/BA can get you to OSL isn't until the next day from when you were orginally scheduled to arrive.