n...9, you are aware that you can change an xONEx ticket anytime after you fly the first segment, for US$125 plus any additional taxes etc your changes might engender? Not suggesting you do that, just pointing out the flexibility.

(For completeness: changes of only date/time should always be free but some airlines have been known to assess a service charge; changes before your first flight might involve repricing your ticket; if the airline ever does anything unilaterally to change your xONEx plans you have them by the sensitive appendages, although they'll probably balk at your suggestion that they charter a Gulfstream for you.)