I have been editing the above.
CH-47A, B, & C's are clearly to be of Boeing Vertol manufacture.
The majority of the USAF CH-47D's listed have had incorrect registrations listed in the database and have now been corrected by the addition of a sixth numeral.
This is because they were re-manufactured from A, B & C variants and were allocated special series of registrations.
The only query I have is that most other sites have allocated Boeing as the manufacturer for CH-47D, presumably as the re-manufacture manufacturer!
Our listing uses a mixture of Boeing Vertol (the original manufacturer) & Boeing.
My preference is for all CH-47D to be Boeing.
Other variants are not a problem.
Any thoughts please?
Malcolm.