I need help finding out what time my family get to airport? -

http://flights.usairways.com/FlightStatu��They leave 6pm Philly time and get here three hours later California. Thats what the lady on the phone says. But I calculated it and it appears they get here at 6 pm not 9pm. Is the 8:59pm mentioned in the link above, philly time? Can anyone help me understand this? I dont know if I should go to the airpiort at 6 or 9???

The flight takes six hours non-stop, according to Expedia.They are departing 6 PM Philly, which is 3 PM CA. A six-hour flight will arrive at 9.

Local time are always given. So they left at 6pm local time and arrive at 8:59 local time.