Emergency services rushed to Newtownards Airport following a 999 call on Tuesday evening.
A PSNI spokesman said: “It was reported to police at 8.20pm that a light aircraft had crashed at the airport.
“Officers and other emergency services attended the scene.
“Sadly, two people were pronounced dead.”
Emergency services rushed to Newtownards Airport on Tuesday
Rebecca Black
Two people have died after the tragedy in Co Down
Rebecca Black
The Northern Ireland Ambulance Service attended, and said no patients were taken from the scene on the Portaferry Road in the town.
A statement said: “NIAS despatched two emergency crews, a doctor and an ambulance officer to the incident.
“No patients were taken from the scene.”
Alliance Party councillor Victoria Moore said the incident is a terrible shock to the community and described it as "very sad news".