Air Force One touches down in SA

President Barack Obama's plane has touched down at the Waterkloof Air Force base in Pretoria.

US President Barack Obama is welcomed by International Relations Minister Maite Nkoane-Mashabane at Waterkloof Air Force Base in Pretoria on 10 December 2013. Picture: Barry Bateman/EWN.

JOHANNESBURG - Air Force One has touched down at the Waterkloof Air Force Base in Pretoria.

The presidential jet touched down just after 7am and taxied to the main terminal.

US President Barack Obama and his wife Michelle are leading a high-profile delegation from the US including former presidents George W Bush, Bill Clinton and Jimmy Carter.

Confirmed on Air Force One was George W Bush and his wife Laura, Hillary Clinton and her daughter Chelsea and several senior White House advisers including attorney general Eric Holder, national security adviser Susan Rice and economics adviser Valerie Jarrett.

Bill Clinton and Carter are travelling separately to South Africa.

Minister of International Relations and Cooperation Maite Nkoana-Mashabane welcomed the delegation.

Obama's motorcade was seen stuck in traffic along the M1 highway at around 9am.

Motorists along the highway were shocked to see who they were travelling with.

My dad was stuck in traffic with Obama this morning. Wonder if he got his ETag?

The delegation will join dozens of world leaders from across the globe who have been arriving in South Africa for the past 24 hours to attend the memorial service being held at FNB Stadium in honour of Nelson Mandela.

Since last night, the base has been welcoming leaders from all over the world including Gabon and India.

The Tunisian presidential jet also touched down at Waterkloof a short while ago.

Convoys of cars have been escorting world leaders out of the facility.

Meanwhile, the gates are open at FNB Stadium and people are filing in to the stands ahead of today's memorial service.

The event is expected to be one of the biggest gatherings of world leaders in history.

Nice one. " @TashakiTasha: George W Bush waved at me on his way to the #MandelaMemorial. Was so awesome"