“crashed” does not imply a controlled or planned descent necessarily
given the total absence of communication, either an in-air catastrophe (i.e., bomb) or else jihad-suicide nose dive would seem to be the likely possibilities
http://edition.cnn.com/2016/05/19/middleeast/egyptair-flight-804-liveblog/index.html?adkey=bn
(apparent CNN feed)
Wouldn’t a nose dive show descent? They keep reporting there was no descent picked up.