I have always dated my DONE4 and always changed the dates/flights - even the airline for a pre-booked routing (eg. BA v. QF). I have never had a problem. When calling AA you need to ask for the RTW desk. When calling QF anyone will do (may be bc it is QF issued). The only disadvantage with dated v. open-dated is that if dated you need to remember to change the date before it comes up.