Back in the days of DC8 at Montreal International Airport known locally as Dorval, Air Canada tried to remove me from a flight to London LHR. I refused to deplane and they got the RCMP who informed me that I had to get off. I stopped at the cockpit door and advised the captain that I had booked and paid for mt seat seven months earlier, I then advised the captain that I wanted my checked bags and informed the RCMP officer that if the aircraft was moved with my bags on board the captain and co-pilot were to be charged with theft and I then stepped off the aircraft. It took about 10 seconds for an apology to be issued and I was offered a seat in first class . I have not flown on Air Canada since and will never fly with them again.