there's several groups of pro russian rebels were in control of the crash area. they say a number of bodies have already been removed, although it's now clear who moved them. it's still not known what exactly downed the airline he, either. it was a russian-made surface to air missile. russia has denied any movement. there's been a lot of discussion about why malaysian flight 17 flew over a combat zone. the pro russian rebels in eastern ukraine had downed ukrainian military airplanes, so why wouldn't a pilot avoid the area? richard quest considers that question. >> reporter: the questions not surprisingly go to the very core of why the plane was flying there. it must immediately be sail that the air route that mh-17 was taking was a legal, legitimate, open air route. and while some airlines, like