one of two missiles, one that entered the fuselage of the aircraft and exploded inside. the other would be something that exploded outside and sprayed shrapnel, which then punctured the fuselage, explosive decompression. it would be helpful to know from that which type of missile it was. lessons can be learned for future construction of aircraft which might reduce this sort of risk. that's the main thrust of the investigation. they want to know why it happened. they also want to learn lessons from it. >> also the big lesson here is, can we fly a plane -- i mean, obviously we can't in a particular case such as the conflict over eastern ukraine, but over the years, planes have flown at over 33,000 feet over conflict zones. >> yeah. >> but this is changing this calculus entirely for ordinary passengers. >> as we say, it's a completely new situation that people find themselves in. i think something like 300