My first business class flight was an upgrade on Air Canada in 1991 from LHR to YYZ. My dad had purchased a full fare ticket, and on checkin at the old T3, the agent looked at the ticket, and called his supervisor over. I was a bit nervous and asked if there was a problem (It was a one way ticket through to YWG). His answer, the flight is full and we are looking to upgrade some passengers. Needless as a 21 year old this was hitting the jackpot. It was the old AC B747-200, with recliner seats and overhead screens, but certainly a lot more comfortable than economy, and the service was certainly to write home about. Sitting in the nose of the aircraft was a great experience. I do not remember using any lounge back then.