There are a few things to consider when answering this question. For starters, the age of majority in most states is 18, so technically a 17 year old may not be able to fly alone without parental permission. Additionally, even if the 17 year old has permission from their parents, the airline may still require a letter of consent or other documentation before allowing the minor to fly solo. Finally, it's worth noting that some airlines have their own policies regarding minors flying alone - so it's always best to check with the airline directly to see if they have any age restrictions or other requirements.