I suspect the plane was full of high level foreign and domestic Obama campaign contributors, out to vicariously re-experience 9/11 from the terrorist’s perspective... The photo-op just being a pretext to celebrate the progress of the currently successful social and economic attack on America.
In any case, I doubt we will ever be told who was on that plane.
A one hundredth day celebration of the terrorist attack on the World Trade Centre. YEP. Commemorating 'their bravery' no less.
It was a TRIBUTE! (IMHO.)