The way the A is pronounced it's very long. Same with the long O. Phone, for example, sounds closer to Phowen. It's just the quirks of language.
The thing to keep in mind is language is changing all the time and becoming more different all the time. There are linguists scrambling to study the Seattle accent, which people used to think was just a California accent. In England, there are many different accents in London alone. The general rule is, the closer to the source, the more diverse it'll be. In the United States and in Australia, there were only a few different accents at landing (depending on which groups from England as well as which other immigrant groups arrived), but they've all started diversifying.