Originally Posted by
jpezaris
For me (getting back on track), I've never understood why PNRs use the full character set. To eliminate potential ambiguities, one would expect they use only one of 0/O, 1/I/L, J/G (many non-native English speakers get those confused), V/W (again, can be confused in other languages), etc.
That's why there are various phoenetic alphabets in use - none of these are confused then.