Kellner spent 14 years at Continental in a variety of senior management positions, including CEO, until his retirement
from the airline in 2009. He currently is president of private investment firm Emerald Creek Group and serves on the boards of Boeing and Marriott International. According to Sabre, previous chairman Sam Gilliland will remain on its board. Tom Klein last month succeeded
Gilliland as CEO. Kellner assumes his responsibilities at Sabre amid speculation
that the company is preparing for an initial public offering.