... just North of Chiltern. Suprise suprise...about three aircraft sitting dead on the route between 1000' and 2400' One of them, probably a R22 or R44, judging by it's groundspeed, ...
Just North of Chiltern (NDB) also happend to be the entry (or exit, subject wind) lane for Denham, which might account for why these air/ heli pilots were there.
Was this location and the e/e lane location not covered in the planning briefing for the display pilots?
h-r