747 freighter main deck numbering
Good day all.
Quick question. Was watching a CBT about the weight and balance of the 747F and it mentioned
that the main deck is labeled from A-T starting from the nose as A, and to the tail as T.
It then mentioned that letter I, N, and O are not used.
I checked my weight and balance manual and its correct.
Curiosity is getting to me.
Why isnt I, N and O used to label the main deck?