I believe this is called the Cygnet formation. This would be number 8's last airshow, as it crashed enroute to Manitoba for another airshow. Thankfully, the pilot ejected.
Canon EOS 20D
,Canon 70-200 f2.8L IS, w/1.4x II, Cpol 1/1000s f/8.0 at 200.0mm iso400
full exif