manufactured from 2015 forward. it doesn't help anything in the past. >> and there are 20,000 planes up there now. could take a lot of time to retrofit. speaking with mark weiss, our aviation analyst, longtime american airlines pilot, he made the point that a boeing 777 has more metal in it than the airbus, which was the air france plane, which has more composite, which is therefore more likely to float, making parts of the 777 less likely to float because that metal content. does that make sense to you? >> in some respects. i admire mark weiss -- i know him quite well and he's definitely the knowledgeable person on the 777. but i would argue a little bit that most of the composites on the airplane bus, and i've been at the factory, i was there when the 380 was being built and observed their manufacturing practices, what's mostly composite on those aircraft, what they focused on is the control surfaces and the mounting of the controlled surfaces to be composite. the fuselage, while it does have