I've called the RTW desk a few times before asking them to ask yield management to release a transcon A class seat as well as LAX-LHR seats.. 100% hit rate for them on releasing the LAX-LHR one within 24 hours of the call.. but about 50% it doesn't happen, and I just call back a week later and ask them to try it again... most times I've asked is 3 times in the span of about a month, and eventually I get my seat on the transcon..

but regardless, its really a PITA.. and the RTW desk reps are quite sick and tired of people calling about A class seats having no availability on the transcons..