The correct spelling of the phrase "is hot trail" is /ɪz hɒt treɪl/. The first word "is" is spelled with the letter "i" followed by the letter "s" and pronounced as /ɪz/, with a voiced "z" sound at the end. The second word "hot" is spelled with the letters "h," "o," and "t" and pronounced as /hɒt/, with a short "o" sound. The third word "trail" is spelled with the letters "t," "r," "a," "i," and "l" and pronounced as /treɪl/, with a long "a" sound at the end.