Originally Posted by
MSPeconomist
Doesn't EC261 apply because the flight is operated by BA?
However, with less than 24 hours in London followed by three days at AMS, it would be viewed as IOM to AMS and the intraEU limits would apply.
The issue is not about the airline or flight, but about the fact that the OP did not have a valid ticket. This was the fault of his ticketing agent (in this case Marco Polo) and not of BA, so using EC261 would be barking at the wrong tree and the OP would lose his case against BA because of the absence of a valid ticket.