Last July, a Tupolev passenger plane carrying 168 people crashed shortly after takeoff, nose-diving into a field and killing all those aboard. In February 2006, another Tu-154 crashed during landing in Tehran, killing 29 of the 148 people on board. Another Airtour Tupolev crashed in 2002 in the mountains of western Iran, killing all 199 on board. Iran's worst crash came in February 2003 and also involved a Russian-made Ilyushin that plowed into the mountains of southeastern Iran, killing 302 people. __