The engine's howl steadily builds as the Robinson R44 helicopter's blades churn with increasing velocity. Passengers look out of bubble windows and see grass whipping beneath. In a moment, the turf disappears, fading from view as the chopper lifts higher into the sky. So begins an aerial adventure led by experienced pilots Steve Van Buren and John Holler, who venture into the airways above Austin, San Antonio, the hill country, and central Texas. The air-conditioned copters—equipped with four-way communication that allows guides to maintain contact with passengers—glide through the firmament, as pilots obey all stop-sign-shaped clouds on their way to eye-catching views of sites such as historic Gruene. Crews also bring helicopters to clients for party rentals and assist landowners with predator control and game surveys.