I was project manager for GF TriStar so responsible for purchase and introduction. I was co-ordinator of BA Tristar to make sure all activities worked to plan. The first four GF were purchased outright. The rest were leased. I decided to register UK initially as the Oman CAA was just being set up so I used UK CAA for certification. The four had A4O (Oscar not zero) painted on with the Uk painted over. The UK letters were removed on arrival BAH. Oman used UK CAA on contract. -TY was static at Farnborough Air Show 1976 after a couple of week on line. Though -TZ had been delivered I wanted to be able to say -TY had operated on line and was not a specially spruced up interior for the show.