The spelling of the phrase "are ones tail" can be explained through the use of IPA phonetic transcription. The first word, "are," is pronounced /ɑr/ with an "a" sound similar to the word "car." The second word, "ones," is pronounced /wʌnz/ with a "w" sound at the beginning and a short "u" sound like in the word "up." The third word, "tail," is pronounced /teɪl/ with a long "a" sound like in "ail." Therefore, the correct spelling is "are ones tail."