July '86 Calgary-LHR by Air Canada TriStar 500. Checked-in. Flight delayed 1 hour - "technical fault". Delayed further hour. Then another hour. Then another hour. Then cancelled - crew out of hours. Now past midnight. Arrange special 727 flight to Toronto - no guarantee of onward connection. Then no crew available for 727! Calgary Stampede on - no hotel rooms left in town. Bussed to Edmonton. Bus has faulty gearbox and cannot go over 35 mph - 180 miles to Edmonton! Finally arrive Edmonton 8.00 am and collapse into bed. Arrive Edmonton airport and check-in 2.00 pm. TriStar departs Calgary for Edmonton. Returns Calgary - fault recurred! Flight now completely and forever cancelled. Some pax put on flight to Vancouver (500 miles in wrong direction) for connection to London. Rest of pax (me included) booked on evening flight to LHR. Not offered any accommodation - 6 hrs to flight. Kick-up fuss - offered day room in hotel. Next to swimming pool with lots of screaming kids. Finally arrive LHR 26.5 hours late. Air Canada - never again!!!!