The search for a missing teenager has stepped up in Queensland, with police declaring two crime scenes almost a week after she vanished.

Phoebe Bishop, 17, was last seen at Airport Drive outside Bundaberg Regional Airport about 8.30am on May 15.

Bishop was booked in for a flight but police say she never checked in.

She has not been seen or heard from since that morning.

A property in Gin Gin, a town to the west of Bundaberg, where Bishop was living, has been declared a crime scene.

A grey Hyundai ix35 has also been seized and declared a crime scene.

Police believe this was the car she travelled to Airport Drive in.

The police are requesting that individuals who have dashcam or CCTV footage of the vehicle near the Airport and Samuels Road in Bundaberg, or in Gin Gin on May 15, to step forward.

Bisop is described as approximately 180cm tall, with a pale complexion, long dyed red hair, and hazel eyes.

She was last seen carrying luggage and wearing a green tank top and grey tracksuit pants.

Investigations are ongoing.