The latest published BA version of the rules (thanks to ScottC) say:

"Within USA/Canada only one non-stop or single plane service transcontinental flight permitted.
A transcontinental flight is defined as travel between a city in column A and a city in column B.
COLUMN A COLUMN B
Baltimore Md Las Vegas
Boston Ma Los Angeles Ca
Ft Lauderdale Fl Oakland Ca
Hartford Ct Portland Or
Miami Fl San Diego Ca
Newark Nj San Francisco Ca
New York Ny San Jose Ca
Orlando Fl Seattle
Philadelphia Pa Vancouver, Bc
San Juan Pr
Toronto On
Washington Dc"

So in this case JFK-LAX and JFK-YVR are both transcons. Occasionally the rules don't keep up with new routings so you can do transcons which are transcons as far as OWE is concerned.

(sorry for the formatting - look at it in a fixed font)

[This message has been edited by christep (edited 01-02-2003).]