Upvote:3
Do you have checked luggage? You face the risk of it carrying on to Philly without you.
Also some airlines get antsy about this, especially given you'll be checked in, and can sometimes make it hard for you to travel with them again.
Another option would be to go to the service desk on arrival and ask if there's an earlier flight available, meaning you don't run the issues of losing your flight, and can still get back earlier than the long wait would have required.