Walmart has appointed Tom Horton, former chairman and CEO of American Airlines, to its board of directors, effective as of Nov. 21. Horton became the sixteenth member of the board and will also serve as a member of the audit committee.

Horton, who has more than 30 years of business and finance experience, joined American Airlines in 1985 from international accounting partnership firm Peat Marwick & Company (now KPMG). He continued with American until 2002, rising to the role of senior vice president of finance and CFO, before leaving in 2002 for AT&T, where he served as CFO and later was appointed vice chairman. In 2005, Horton led the evaluation of strategic alternatives that ultimately led to the combination with SBC Communications, which formed the new AT&T.

In 2006, Horton returned to American as executive vice president of finance and planning. He was named president in 2010, and chairman and CEO in 2011, where he led American through a successful restructuring and turnaround, culminating in the merger with US Airways. He stepped down as president and CEO of American last year and remained non-executive chairman of the board until June.