Movie-goers watch How to Train Your Dragon 2, the first movie of a double feature at the Saco Drive-In in Saco. Drive-in movie theater operators say more than 200 of the remaining 348 drive-ins in the country have made the costly switch from film to digital.

Jen and Philip Mason, along with their sons Skyelar, left, and Trysten, watch the previews at the Saco Drive-In in Saco.

Light from a digital projector beams from the projection house at the Saco Drive-In in Saco.

A sign reminds customers where to tune their radio to switch on their car radio to pick up the audio at the Saco Drive-In in Saco.

A customer douses her french fries with ketchup at the concession stand before the start of the movies at the Saco Drive-In in Saco.

A customer stops at the box office at the Saco Drive-In in Saco. The number of drive-ins has been declining steadily for years. The Saco Drive-in claims to be the second oldest still operating in the U.S.

Shawn Smart, on vacation from Athol, Mass., plays catch with a football while waiting for the sun to set at the Saco Drive-In in Saco.

Mike and Naomi Gibel, and their children Norah, 4, left, and Issak, 7, watch a movie from the back of a pick-up truck at the Saco Drive-In in Saco.