U. Edwin Garrison, president and chief executive officer of Thiokol Corp., has been appointed to the board of directors of Questar Corp., to fill the remainder of the three-year term of John S. Hinckley, who died last October.

Questar officials also announced that Garrison and W. Whitley Hawkins, executive vice president of marketing and stations for Delta Air Lines, have been nominated for election to the board for three-year terms beginning in May. The board election will be held at the company's annual meeting in May.Garrison has been president of Thiokol since July 1989. He serves on the board of trustees of the Air Force Heritage Foundation of Utah, is a member of the board of directors of First Security Corp. and serves on the bank's Northern Advisory Council.

Hawkins lives in Atlanta, Ga., and joined Delta in 1955 as a transportation agent. His responsibilities with the airline have included military and government transportation, advertising, passenger sales and marketing and he is responsible for Delta's Salt Lake facilities.