Hi Jess,  I used those when my hair was shorter.  I kept them in my carryon and used one tube after landing.  Airhair isnt pretty.  Anyway, what I do now is oiling with olive oil b4 going to bed (leaving it in all nite).  Then shampooing the next morning.  Of course, my hair is much longer now.  But doing that has helped tremendously.  As to how often?  Pretty much depends on you and your hair.  My simple advice would be to try either jojoba oil (close to natural sebum) or olive oil.  I like the olive cuz my hair is very thick and thigh length again.

Debr

I use exrta virgin olive oil (EVVO) myself.  I leave it in over night then shampoo the next day.

Cheers!