Dornier DO28 twin turboprop.
Isn't that a typo? The venerable Do-28 is twin piston powered, and doesn't look like carrying 15 "passengers" (though people will do a lot, in sports).
Was by any chance a Do-228 being meant? That at least is a turboprop, and yes turboprops are highly wanted for PJE operations given their strong climb performance.
Do-28's can't be flying in great numbers, anymore. They might do well for PJE, though, if the cost of fuel burn and maintenance remains bearable.