I was trying to verify the policy for changing the date on a flight booked with frequent flyer miles and came across this helpful page.
You must complete your flight by Jan 01 of the year 0002.Not sure what kind of aircraft you would be on since the Wright brothers 1st flight wasn't until 1900, and according to Wikipedia, the hot air balloon wasn't much earlier
Don't think the asterisk clears anything up. All it talks about is how much this change is going to cost you. And I wonder what you should pay the airline change fees with? May I suggest
Not sure how long this flight re-booking policy will be in effect, as the airlines change their rules all the time, so if you are going to check it out, do so soon. united.com/reservation/flight/cancelAwardRebook.aspx