systems in the continent. jon: this particular plane, an md-83, was built by an american company, mcdonnell douglas, now owned by boeing. it was flown by american air carriers for quite a while. and in fact there were a couple of incidents when it was flying, when it was flown, i'm sorry, alaskan airlines in which it had to land prematurely because of smoke in the cockpit, that kind of thing. we have that graphic. maybe we can get it up on screen in just a moment. but at any rate, some of them date back to like 2002, peter, for instance. is that unusual for a plane of this age and will they look that far back into its history? >> first of all, no, it is not unusual. the md-80 was for many years a very common aircraft in the united states. american airlines still flies almost 250 of them. so it's, it's a good aircraft. it has got good safety record. it does consume a little too much fuel. so u.s. carriers tend to be shedding themselves of this aircraft but the investigation will go back as far as necessary to identify what happened to this plane. you know, there are reports that there were engine problems. they will loo