WASHINGTON (December 9, 2013) President Barack Obama was en route Monday to South Africa to attend a national memorial service for Nelson Mandela.
Mr. Obama and his wife, Michelle, boarded Air Force One under cold, rainy skies this morning for the long flight.
Former President George W. Bush was already on board, along with former first ladies Laura Bush and Hillary Rodham Clinton.
Former President Bill Clinton is traveling separately from Rio de Janeiro, where he's been attending a Clinton Global Initiative event, and former President Jimmy Carter is planning to join the group in Johannesburg.
The only living U.S. president who won't attend is George H.W. Bush.
His spokesman says the 89-year-old former president is no longer able to travel long distances.
The American leaders will join dozens of other dignitaries and tens of thousands of mourners at the memorial service at a stadium in Johannesburg.
Mandela will be buried next week, after a state funeral in his home town.
He died last week at the age of 95.