Hi,

We were supposed to fly from BUD-LHR on BA865 on Sunday (6/19) to catch a connecting flight, but received notification the night before that our flight was cancelled. They automatically rebooked us on a flight the next day, which obviously didn't work for us. Apologies in advance if these are dumb questions (first time dealing with EU261), but:

1. I am not certain if I should be going to BA or Finnair for this claim. The flight number is BA, and on FlightAware it shows BA metal. However, on flightradar24 it shows that the flight is usually operated by Finnair metal.

2. Is there a way to find out the reason of cancellation before submitting a claim or should I just go ahead?

3. Since the cancellation came with such short notice, we had to rebook (at our own expense) a Wizz Air (BUD-LTN) flight at a high cost for the same morning just so we could make our connecting flight back home from London. Aside from the standard EU261 compensation, would we be entitled to request compensation for these alternative flights, plus the transportation cost from LTN-LHR?