GPS should pick up E-470. It's been there awhile--it opened well before I left Denver, and that was three years ago. It's easy to find in any event. The exit from I-25 to E-470 is down in the far south suburbs, so it's not like trying to find an exit in the middle of the city. And I believe E-470 will take you right to Pena Blvd., which takes you to the airport.