as far as a fairway ace goes, I belive they are just saying someone made a shot so amazing that it should have been an ace.
and if black aces count, I would have one ace more than I really do ;-).
and as far as hitting metal goes, playing my campus course that I have hit metal of every of the nine tees, only to ace two of the holes (one twice) I hit metal on 3 of 9 today, no aces. put an -8 for nine holes (tieing my record, Ive thrown 8 down a couple times, never 9 for 9 though) knowing two throws chained out (third hit chastity belt, rolled and missed comeback putt for my only 3 for the round) so after the two chaining out, they made me think, if they both stuck, I would have scored a -10 on nine holes... now that would be a unbeatable CR (the course really only has 2 run at the chains kinda holes, and only 3 others that anyones aced)