Originally Posted by
SeriouslyLost
JL do paid upgrades on selected routes, regardless of ticket issuer. Usually US$200 to go from Y to W. They'll sometimes just bump you up to J anyway even though you've only paid for the W upgrade. JL's new PE & J product is excellent IMO.
Great information.
The OP wanted to use miles and copay, no way.
OP, cross-posting is frowned upon here; your thread in the JL forum has been closed. /Moderator