There was a thread earlier about what to do when you need to change your routing because you cleared a waitlist. It mentioned that if there was a time change in your original itinarary that you could have those miles redeposited to your account (don't want to pay becuase route is not identical as original). Question is...do I reticket with additional miles and then ask to have my miles redeposited. Is there a possibility of no availability of "additional" seats?