Love that people apparently know more than someone who actually did this for a living
It has nothing to do with knowledge, it has everything to do with stance. The airlines will always take the stance of doing whatever is cheapest and most convenient to them. Passengers generally take what is given to them by the airlines for granted, even if it may not fulfill neither the spirit nor the letter of the law (i.e. airlines rebooking passengers on flights departing more than 9 hours later when obligated to provide a speedier booking under Canada's APPR).
Yeah BA is known for routinely denying valid EU 261 claims and making people take them to court arbitration. They'll often pay up before the court date, usually at the last minute when they realise the customer isn't giving up, but they know most people won't bother to take it that far.
This has been my experience with some airlines (**cough** Air Canada **cough**). To Qantas' credit, I didn't have to fight them to get the 600 Euros compensation owed under EU261 when my Singapore to Sydney flight got delayed. They agreed the following day and paid up.
Anyway my favourite part of the EU law almost never gets mentioned, the right to free rebooking (to another flight on any airline) in the event of significant delays or cancellation.
There is a right to rebooking although the language is somewhat ambiguous as to what sort of rebooking must be offered. For instance, do they need to put you on the next available flight operated by any airline? And what if they only have seats available in business class? One of the bright spots to Canada's APPR is there is clarity here: yes to both questions. With that being said, if the travel is international in nature then you can in effect force an airline to rebook you by virtue of Article 19 of the Montreal Convention which states that airlines are liable for up to $9000 USD in damages occasioned by flight disruptions where they did not take
all reasonable measures to prevent the disruption. In such a case, if the airline were to drag their feet on rebooking, you would be within your right to simply buy a new ticket and send the airline the bill. And before anyone brings it up, no I haven't had to exercise that right. So far airlines have followed their obligations to me without having to pull out the big guns. With that being said, I never thought I'd have to chase Air Canada down to get the $1,000 CAD owed to me under the APPR when they cancelled my flight, but pursued them via the Canadian Transportation Agency which ruled that they must compensate me.
As I tell people all the time, in the event of a flight disruption it is the passenger who generally holds all of the cards and the airline who has to open their wallets.
-RooFlyer88