If I book YVR-LAX-FRA-BRU in J (lots of award availability, months out), can I then call if F availability opens up LAX-FRA (usually seems to open up a couple of days in advance)? I know that there's a 50 euro fee to change an award booking, but is this per change or for the booking overall? Flying in J I'd go for a short layover in FRA, while in F I'd take a later flight FRA-BRU so we could do the Porsche rental.