The spelling of the word "am within area" follows the phonetic rule of English language. The initial sound "æm" is spelled by the letters a and m respectively, pronounced as /æm/. The word "within" follows the same rule as its initial sound is spelled with the letters w, i, th and n, pronounced as /wɪθɪn/. Lastly, the word "area" is spelled with the letters a, r and a, pronounced as /ˈɛːriə/. Overall, the spelling of this phrase is consistent with the standard conventions of English phonetics.