New York ? In choosing the anchor team of Elizabeth Vargas and Bob Woodruff to replace the late Peter Jennings at “World News Tonight,” ABC News President David Westin concluded the job was too big for one person in an age when news is available instantly.

ABC also said Monday that “World News Tonight” would be the first network evening newscast to broadcast live for three different time zones – Eastern, Mountain and Pacific. Its anchors will travel frequently to the site of major news and update stories during the day on the Internet and for cell-phone users.

“You need more than one anchor,” Westin said. “One person can’t do all of this.”

Left out of the mix was veteran ABC newsman Charles Gibson, co-host of “Good Morning America.” Gibson, Vargas and Woodruff have been the main substitutes since Jennings announced in April that he had lung cancer. Jennings died on Aug. 7.

Vargas, 43, and Woodruff, 44, give ABC News the opportunity to establish an anchor team with the potential to match Jennings – sole anchor for nearly 22 years – in longevity. Gibson is 64. The new team also could attract younger viewers to a format that has one of the oldest audiences in television.

“This is the right team to take us forward,” Westin said. “My clear goal is to make sure we have the strategy for the future and not just the past.”

Their official start date will be Jan. 3.

This photo supplied by ABC shows Elizabeth Vargas and Bob Woodruff, named co-anchors of an expanded version of ABC's World

Although declining in viewers and influence, the evening newscasts are still considered the flagships of the broadcast networks with their anchors the most visible faces. It’s the first time since the brief mid-1990s pairing of Dan Rather and Connie Chung on CBS that a network has used an anchor team.

Vargas, a self-described Army brat who is married to singer-songwriter Marc Cohn, will keep her job as co-anchor of the ABC newsmagazine “20/20.”

She will be the first chief network anchor with Hispanic heritage. Her father is from Puerto Rico and her mother is Irish.

“I am so proud,” she said. “I know what this means to Hispanics in this country … to have people who look like you and talk like you in positions of importance.”

Woodruff, from outside of Detroit, is a father of four and lawyer who turned to journalism after working in Beijing during the Tiananmen Square uprising. His first evening news experience came on CBS – a seven-second evening news sound bite as an interview subject. He’s covered the Justice Department for ABC and was the weekend “World News Tonight” anchor.

“I am ecstatic at having been given this opportunity,” he said.

The selection enabled ABC to leave Gibson at “Good Morning America” and not disrupt a broadcast that has become more competitive with NBC’s “Today,” which this week marked 10 years on top of the ratings. The morning shows are the most lucrative and chief area of growth for broadcast networks.

“I think ABC decided to take one risk instead of two,” said Bob Zelnick, former ABC newsman and now dean of Boston University’s journalism school.

Westin said his anchor decision was made solely with “World News Tonight,” not other broadcasts, in mind. Although Gibson was interested in the evening job, he told Westin that “‘I have a great job now and I will be perfectly happy whichever way this goes,”‘ the news chief said. “He’s been steadfast about that.”

Gibson did not immediately return a telephone call seeking comment.

“World News Tonight” has been second in the ratings to NBC’s “Nightly News” with Brian Williams, 47, who just completed his first year since replacing Tom Brokaw.