> In a sign of the potential difficulties facing crash investigators, the head of Iran's civil aviation organisation was quoted as saying the Ukrainian plane's

> In a sign of the potential difficulties facing crash investigators, the head of Iran's civil aviation organisation was quoted as saying the Ukrainian plane's black box would not be handed over, either to Boeing or the Americans. Would they hand it over to Ukraine who could then hand it over to Boeing? If not, how likely is it the investigation will be reliable?