Actually Andy Moor himself stated on his forum that whatever was said in Air For Life and Halcyon were totally random things except the parts where she DID say Air For Life. Other than that, he simply played around with the vowels that he asked her to record in order to produce a melodic sort of phrase.
Dude this is pretty amazing!! I tried out what Tranced said, and it CLEARLY says "What's on my mind - Fly away"!
I uploaded a sample for those who want to check it out, its really short, 500kb
EDIT:
sorry, the sound i uploaded was slowed down before, here is the link of the fixed sound, Air For Life Reversed: