I've been watchiing the EAA live feeds from Oshkosh all this week on YouTube.
The warbird camera: https://youtu.be/L-PGb9zqa34
The video feed includes the tower to aircraft communication.
Anyway, I counted this morning and there appears to be fifteen C-47/DC-3 aircraft in attendance this week. Some of the airplanes at Oshkosh flew the D-Day commemeration last month. Ten of the airplanes flew in formation during the airshow the other day.
Just thought I'd pass thhis along.