"a flypast is planned and you will not be disappointed"
Surprised or disappointed I think are the only 2 options when it comes to flypasts these days.
Just as long as it's not a 100 aircraft flypast padded out with AEF and gliders, although given overall numbers and op tempo, we can forget any idea of a fly past of 100 fast / pointy operational types.
Assuming the Reds and BBMF are included, that just leaves them with ~ 85 to find to get 100 aircraft up. I'd guess at least one of the 2 'new' AD sqns of Tiffies plus a Tonka swansong.