The only somehow "civilian" aircraft on the apron of the air display SIAF 2023 is this Dornier 228, which is operated by Canadian air carrier Summit Air on behalf of parachute group Royal Air Force Falcons.
Dornier Do.328-300 Jet of Private Wings transported football players of Spartak Trnava from Piešťany airport for their European Conference League match against UK´s team Newtown.