some people have focused on, the casualness of it, does that -- is that common? does that count as casual language? >> well, yeah, it's nonstandard. but that frequency is probably used all the time and the controllers know that the pilots know and vice versa. >> so technically, the co-pilot should have reread ho chi minh city, 120.9. >> yes, but they've probably done this hundreds of times and it just goes -- >> so as far as you're concerned, not much to glean from this? >> no, and we seem to be focusing on the repeating of the altitude a bunch of times. the way i look at it, if i wanted a higher altitude to go into that air space, the way i coax a controller that i want a