Chris Hoffmann wrote:

From what I've been able to find, I gather that these aren't in use in the
US anymore, and haven't been for some time./snip/

Chris,

First, thats "Low Frequency American" airway to you, Mister

Second, as others have pointed out, these are still used extensively up
here in Alaska. Most are defined by NDBs, while some are "one ended",
and terminate at a VOR. Heck, we still routinely fly (gasp!) NDB
approaches, although the GPS is certainly taking over in popularity.

Third, ever hear of an "NDB/DME" navaid? Yep, we have 'em, very handy
in the bush.

Happy Flying!
Scott Skylane