Thanks for the comments.

John,

The USAF are height restricted on the low-fly routes. It is only on very rare occasions that they are permitted down at lower levels. You can catch them coming through the Dinas Valley on the Bwlch, but you have to be a few hundred feet higher than I was. I was after RAF front liners through the Bwlch Exit, but sadly they didn’t come out in force.

Image of one of the F-15s through the Bwlch on 17th March at the following link. If you are after F-15s with terrain behind, then you have to be on the Bwlch proper!

http://forums.airshows.co.uk/cgi-bin/ukarboard/ikonboard.cgi?;act=ST;f=9;t=45005

TJ