Anyway, what's all this "Mach Loop" nonsense? It's "My-C^nt-Lips" to real fighter jocks. Always known as that along with other favourites like "Smokey Joe's", "Playboy Lake", "Sally's T!ts", "Moon Country" and "Star Wars Valley". Some of these favourites are on this Aircrew Map of Great Britain:
http://ccgi.piers.plus.com/ball/aircrew_map_of_uk.pdf
"Mach Loop"? Pah, that's what the Spotters call it...
LJ
PS. It's been a flow arrow loop for at least 30 years...