thanks, hlg6016
it looks like a lot of models with the numbers i was interested had 'cx' in the notes...
i would guess prop planes that were canceled in the immediate post ww11 era due to cessation of the belligerant festivities or to make room for jets.
thanks, bzb. your numbers are a bit higher than the 100xxx-110xxx series i was interested in.
btw, i heard you needed bookends for your logbooks. is that true?

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i would guess the uc-45j bug smashers we used for nav trainers around '68 in vt-10 had 5 digit bu nos.
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http://www.flickr.com/photos/tailspin_tommy/291045027/
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i remember planning a nav hop from p-cola to i think beaufort. i was plotting courses down to the nearest inch and the headings to the milliradian with a micrometer for the short hop
....there was an old nap chief at the table, big pot belly, greasy cotton flight suit, smoking a stubby cigar. he was writing numbers on his hand.
there was an old c-117 out on the transient line.
i asked him where he was headed,
"hawaii, wanna come ?"