Originally Posted by
SIN1K
... 1. Do I have to use the whole $1000 for one trip? ...
No, the remainder is available for future usage
Originally Posted by
SIN1K
... 2. Can I use it for multiple tickets for the same trip? ...
a given ETC can only be used for one passenger on the same PNR. But it can be used by others on a different PNR.
See this thread's wiki for more.
Originally Posted by
SIN1K
... 3. Does it apply to code share flights?
No but there is a multi-step method some have used in the wiki of
http://www.flyertalk.com/forum/unite...r-flights.html.