William (Billy) John MacAllister was born on October 19, 1962, on the Isle of Mull, Argyll and Bute, Scotland.
William, who was called by the name of Billy, was a talented junior golfer. He began his golfing career in 1976 at the Tobermory Golf Club at Erray Road, Tobermory, Isle of Mull. After he won the President’s Cup at the age of 13, he continued to win many trophies over the years. Due to his talent, he became a professional golfer.
Billy was traveling on Pan Am Flight 103 to the United States with is fiancé, Theresa (Terrie) Elizabeth Jane Saunders. They were to make family visits in New York, New York, and then go on to Minneapolis, Minnesota, to spend Christmas with friends there. Terrie and Billy were to be married in June 1989.
When the Tobermory golf club learned that Billy and his fiancé, Terrie perished on Pan Am Flight 103 in 1988, the Tobermory District Council and the Highlands and Islands Development Board Members donated the “William MacAllister Trophy” for the best handicap score in the MacBrayne Competition, in 1989.
Terrie Saunders was working at Barclays Bank in London as part of the training team in 1986, before joining the Marketing Department in 1987. Barclays Bank put a seat her memory at West Moors Cemetery where Terrie and Billy are buried together.
According to Terrie's friend Alison Furness, "Terrie was traveling with her boyfriend, Billy, who was planning a new venture taking Americans around Scottish Golf Courses. This trip was mainly to explore business leads, but also for the two of them to enjoy New York before Christmas. Billy was a lovely guy with a great sense of fun. They were both excited about the future.”
Billy left his mother, Euphemia MacAllister Foley