I have a claim in for a flight that BA said was delayed due to a bird strike so EU261 does not apply.
The flight that must have been affected was at least 2 legs earlier. ie :-
<somewhere unknown> to LGW has a birdstrike
LGW to BDA is delayed due to the required repair
BDA to LGW (my flight) is delayed due to the late incoming plane
I assume there must be some point where BA cannot keep blaming a single historical event and denying EU261 claims but I am unclear if this is stated clearly in the legislation?