FWIW, I was born in SE Alaska, although lived in central AK for a bit and in Kodiak for a little bit.

In Alaska, survival is pretty much about hypothermia and getting found.

1) Clothes are very important. You want to stay warm and dry. You want to consider not only how to stay warm normally, but how to get warm if you get wet.

1b) In some areas like the southeast (where I'm from) it rains A LOT. Staying dry is difficult, esp. in the bush. This makes #1 even more important. (witness my diatribe about waterproofing)

2) Related to number 1 is the ability to make fire. I'm not sure where you are going, but in some areas fuel is non-existent, and some areas plentiful, but potentially wet.

3) Alaska is BIG. If you go down in a plane, or are in a boat that capsizes, being found is a BIG problem. This land is the poster child for the PLB. Get one.

Of course, GPS is a good idea too. Cell phone is useless in the bush. If you really want communication, you need sat phone. If you are near the coast, boats use VHF heavily, so that is potentially an option, although medium range with line of sight. The upside is with mountains, typically you can get high enough to see water if near the coast.

In regard to planes, it depends. Commercial flights are the same as anywhere else in the US, and you'll have to check most things as luggage.

Bush planes on the other hand typically let you carry whatever you want. Consider most people getting into a bush plane are probably wearing a revolver and have a long arm in their pile of gear.

No idea about medivac flights. You'll have to check with the company.

-john