People attend the unveiling ceremony of the De Wenteltrap monument (winding stairs) by artist Rudi van de Wint, March 27, 2007 in Santa Cruz de Tenerife on the Spanish Canary island of Tenerife, to mark the 30th anniversary of the worst civil aviation disaster. Thirty years ago a PanAm Boeing 747 collided with a KLM Boeing 747 at the Los Rodeos Airport on the island of Tenerife killing 583 people. (Xinhua/AFP) |