Originally Posted by
virtualtroy
There are quite a few places within Europe that also offer cheaper year-round airfares, but not quite as inexpensive as the ones you're alluding to.
Anyway, think I've now answered my own question when I suddenly remembered I've asked it before
http://www.flyertalk.com/forum/showthread.php?t=525687
AFAIK endorsing but retaining routing is a different question to changing routing (with or without endorsing to another airline). Rerouting will always require ticket reissue. Endorsing to another airlines on the same route may or may not require ticket reissue depending on the applicable rules (eg *A allows endorsement between all member airlines except SQ, subject to availability of course).