Heavyjet From , joined Dec 1969, posts, RR: Reply 1, posted (11 years 8 months 2 weeks 3 days 22 hours ago) and read 657 times:
In the US, high altitude airways are also called Jet airways (J180, J52, etc) . They start at FL180 (18,000ft when altimeter is set to 29.92)). Below FL180 airways are called victor airways (V82, V64, etc).
Jetguy From , joined Dec 1969, posts, RR: Reply 3, posted (11 years 8 months 2 weeks 3 days 20 hours ago) and read 643 times:
Also, just to add to the confusion, it's not uncommon for controllers to clear you via a victor airway when operating in the flight levels, where technically, they do not exist. Proper protocol would dictate that such a clearance would be "via the radials of Victor XXX", but in the real world, they usually just clear you via Victor XXX. This is not a big deal, but it can be a bit confusing when you're just starting out.