The unusual spelling of the word "AIRMAUR" can be explained through its phonetic transcription. The first syllable "AIR" is pronounced like the vowel sound in "hair" [ɛə], followed by the consonant cluster "M" and "R" [mɔːr]. The final syllable "MAUR" is pronounced like "more" [mɔːr] with an added "aw" sound. Therefore, the correct spelling of this word would be "AIRMORE", with the added "e" to reflect the vowel sound in the first syllable.