Two World War II-era planes at the Cape Cod Airfield were vandalized over the weekend, the airport announced Saturday.

Employees at the airfield found that both of the facility’s Douglas DC-3 planes sustained at least $15,000 in damages due to vandalism, according to the airport.

The planes are antiques that were used by the Allies in the second World War, the airfield noted.

“In these difficult times we at the airfield know that more people than usual are utilizing the trails in the conservation land,” the airfield said in a Facebook post. “We welcome this, however this increased foot traffic has started to bleed onto airfield property.”

The airport added, “Doing this to an aircraft is the equivalent to pushing down a World War II veteran just to watch him fall.”