I am flying RTW with Star Alliance. ticket booked on Staralliance.com. Turns out that there are some hidden "gotchas" with doing this. Although the ticket is flexible, ie I can change a segment, I am being told that there is "no availability" on the requested flight. Checking online shows that there is actually availability with the airline (in this case SQ) but on being pressed StarAlliance say that there is no availability "with this ticket" or "with this allocation".
You might imagine I could switch to another SA member to make the change, but not possible.
Two legs of trip ticket issued by Lufthansa but flown by SQ. Can't select seat etc on SQ's website as not booked through them. Lufthansa cant help. Annoying.
In dealing with Star Alliance they act as if they are just a reseller of member airlines' seats, but with no ability to intereact with member airlines.
So - beware of booking RTW on Staralliance.com, I have found it a significant problem dealing with them, lots of calls, not helpful, say there is available, then say no there isn't, then "system down", call us back. Not interested in solving the customer issue, attitude is - we sold you the ticket, now go away. Airlines attitude is - you didn't buy from us, so go away.