South Sudan\'s President Salva Kiir landed in Khartoum on Tuesday for a summit aimed at averting a shutdown of oil pipelines vital to both stricken economies, an AFP reporter said. Kiir, wearing his trademark cowboy hat, arrived on a Kenya Airways jet at about 0710 GMT. The South Sudanese leader was welcomed on the tarmac by his Sudanese counterpart Omar al-Bashir and cabinet ministers as a military band played.