They were not uploaded in a batch - the first of the 14 videos was uploaded on Aug 5, 2011 [1]
So either
a) he planned to make only 14 videos in advance - culminating in the flight video
OR
b) he went back and edited all of the titles.
So I checked the cached version of the previous videos - and it does appear that it is (b) - he edited all the titles adding the 14 after the fact.
[1] [http://www.youtube.com/watch?v=cocLpRzZnvk&feature=chann...]