Frozen,
Are these kits usually kept in an easily accessible place?
I can imagine a kit buried under gear and freight.

Packman,
[color:"blue"]I'm forced to carry anything I want in the plane with me. [/color]
If connecting from an airline, how do you have firestarting stuff
like butane lighter, flare, etc?

[color:"blue"] Vertex Handheld Radio [/color]
I assume this is air band. Do you recommend that model?

[color:"blue"]Man, do I ever hope I never need that thing.... [/color]
Yeah, it could be very grim, even if you are not injured in the
crash, hypothermia and starvation (aggravated by cold) could
be expected. If you make the kit too big, you might start leaving
it behind.

Canoe/Kayak people often wear life jackets that cover and
insulate the torso. I do not know if any of these have a collar that
supports the head (mine did not).