If you study the pronunciation key carefully, you'll see that Mike
spells the "AIR" sound as ER.
E is as in "bet" or "care". Now, carefully say "bet", drawing out the short E sound. Now, replace the T with and a R. You'll get "bare"/"bear".
I admit it's a little confusing--it confused me at first, until I sounded out the example words carefully and got it--but I think ER looks neater than writing AIR.
"Multiple exclamation marks are a sure sign of diseased mind" -- Terry Pratchett
!!!!!!!!!! ← Maud, John, Alice, Peter, Emma, Edith, Lewis, Henry, Isabel, and Joseph