Originally Posted by
WineCountryUA
K fares are not eligible for SWU usage for long hauls.
Once there is more than a 12 hour break between flights, it takes a new SWU.
Most standard RTs (versus some MRs) take two SWUs
Oh, I totally missed that K fares cannot be upgraded.
Sorry for asking this stupid question.
Update: What about RUs?
Update again: I got the answer. Thanks.