Originally Posted by
wanaflyforless
On CO and UA, if am only changing the date, it is free even as general member. On DL or US, that would be a $150 fee (same routing, same flight #s, just different dates).
Exactly. Recently, I couldn't confirm an LH EU segment in C on a US award at booking. Of course availability opened up later, but US wanted to charge $150 to reissue the ticket.

Worse, the agent blamed it on Star Alliance membership rules.