The B777-200 Freighter has positions on the main deck to describe how the cargo will be loaded in a left to right sequence. They are identified as A, B, C, D, E, F, G, H, J, K, L, M, P and R.

What is the reason that the letters I, N, O, and Q are omitted?


1 Answer 1


Those letters are commonly unused in aviation in markings, registrations etc. They might be easily confused with similar letters (I with J, N with M) and are therefore left out.

  • 2
    $\begingroup$ Also O&Q are often mistaken and with some people’s handwriting even C. Also I can be mistaken for number 1 or lowercase L $\endgroup$
    – Notts90
    Apr 9, 2018 at 14:15
  • 2
    $\begingroup$ N turns into Z sideways. O looks like zero. I looks like one. Q and O are hard to distinguish. $\endgroup$
    – TomMcW
    Apr 9, 2018 at 15:37
  • 1
    $\begingroup$ I see all US civialian aicraft with N marking. $\endgroup$
    – vasin1987
    Apr 9, 2018 at 18:37

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