What supplies can only be found in plane-drops?

Some supplies can never be found in random crates, only crates dropped by planes. Which supplies are these?

Solution 1:

 **Survival**
    Low Quality Metal
    Metal Door

**Resource**
    Gunpowder
    Wood Planks

**Medical**
    Large Medkit

**Weapons**
    Explosive Charge

 **Parts**
    Wood Pillar
    Wood Foundation
    Wood Wall
    Wood Doorway
    Metal Pillar
    Metal Foundation
    Metal Wall
    Metal Doorway
    Metal Stairs

This is taken from the rust wiki : http://playrustwiki.com/wiki/Airdrops

edit

I just noticed the scale of this question. Allow me to further add information to my answer.

There are three different kinds of chests found in the world.

Red crates

In red crates you can find the following items:
Medical Equipment
Blueprints
Flare
9mm Ammo
Shotgun Shells
556 Ammo
Loot Sacks
Anti-Radiation Pills
Explosive Charge

Yellow crates

Yellow Crates may contain the following items:
Ammunition
Weapon Attachments
Blueprints
Weapons

Green crates

Green Crates may contain the following items:
Weapons
Weapon Attachments
Ammunition
Paper
Research Kit 1
Blood Draw Kit

There are also the wooden boxes found everywhere (although these commonly contain the least valuable loot there is a rare chance of something of actual value being in there).

Wooden boxes

**Ammunition**
9mm Ammo
Shotgun Shells
556 Ammo

**Resources**
Cloth
Metal Fragments

**Medical Equipment**
Anti-Radiation Pills

**Consumables**
Can of Beans
Granola Bar
Small Water Bottle

The chance of each item spawning is not mentioned in the wiki so that should need some more research.

Solution 2:

The only thing that you can't find, at the moment I write, in crates/red animals are Supply Signals. It has been added a couple of week/patch ago a very small probability (less than 1%) to drop C4 from animals.