STAY HYDRATED

Drink water: the air inside the cabin of a plane usually has a humidity level of 10 to 20 %; much lower than a comfortable typical indoor humidity of 30 to 65%. For this reason, it's very important to take measures to keep yourself hydrated while you're on a plane.  I love adding slices of ginger in my water to help with nausea or a little elderberry syrup to make it sweet and anti-microbial. 

HERBAL FACIAL SPRAY

Bring an herbal facial spray: I love to carry lavender spray to refresh my skin while providing anti-bacterial properties from the essential oils.

BRING SNACKS

Pack snacks rich in antioxidants and vitamin C: it might be hard to pack fresh fruit and veggies but you can dehydrate them. The best way to retain the nutritional value of dehydrated foods is to carefully control the process, which means low heat during dehydration.

SLEEP

Get your sleep:  it might be hard to sleep while on the go but lack of sleep decreases immunity which increases your risk of picking up a cold.  Try a sleep mask.

IMMUNE HERBS

Pack a 1oz cold & flu tincture: just in case you do pick up something be prepared instead of trying to find something at a local drug store.