I well know that in the mini print of terms and conditions, the airlines can nail you if you don't fly as booked.
However in my wife's case, BA cancelled the first flight she was booked on. BA put her on a later flight to Heathrow (involuntarily rerouted I believe they term it). She did then catch the next leg as scheduled. And then BA claimed she had been a no show on one of the outbound legs! We're still waiting an explanation 7 days later!
And assuming that VS-LHRCSA says is correct, we will be waiting another 3 weeks just for something more than a computer generated reply saying "I hope I can assure you that we will be in touch with you again in the very near future"
Ho bloody ho. Letter goes to Wille Walsh tomorrow.