Originally Posted by
thebigtees
I haven't been able to figure out any way to view upgrade space on DL flights [...]
Is this possible?
Unfortunately not, as
cmn.jcs correctly advised, but welcome to FlyerTalk all the same,
thebigtees!
Originally Posted by
verve
I always felt that KVS worked best for me but it looks like time has come to switch to a different tool - how does for example ExpertFlyer compare?
A comparison would be off topic here, but there have been several threads discussing the merits and weaknesses of the three most popular tools. This is the most recent and useful that I'm aware of:
http://www.flyertalk.com/forum/trave...pertflyer.html
You'll find several more by searching, but bear in mind that statements about what the three options are capable of can become obsolete very quickly. The KVS 'tool', in particular, has lost a lot of functionality in recent months.