Hello,
I have flown 20,000 miles the last year.
i used to get horrible ear and sinus infections from the air pressure. I found the way to battle this is too listen to loud rock and chew gum, especially during takeoff and landing. I surreptitisously do this because a lot of times they tell you to turn them off.
I am plagued by bad sinus's, allergies, and asthma on top of AS. Besides helping with the ear pressure, I have found that the distraction of music that I love played loudly drowns out the distractions and the uncomfortable feelings associated with being so close to so many people for so long (my last trip home had three connections and took a total of 32 hours traveling, I never would have made it without my music)
Good Luck, Tell her to always have patience especially with the security.
crazedchef