Kaiyan
To be more exact, also including Czeck sources.
Two Fokker F.IX were built by Fokker
c/n 5106 PH-AGA sold via France (F-APFA) to Spain where it stayed for the rest of its life
c/n 5241 PH-AFK w/o 4.8.1931
12 Fokker F.IX were license built by Avia as F.IX (not F.39) with no known c/n. From deduction the c/n were between 1 - 14
They received serials FIX.1 to F.IX.12 and served with three Squadrons of the 5th Letecky Pluk (81 Sq code letter L, 82 Sq code letter N, 83 Sq code letter P)
Known losses are
L1 crashed 4.2.1937
3 (Sq not known) crashed 22.11.1938
R8 crashed 12.1.1937 (probably not repaired)
2 Fokker F-IX built by Avia for CSA as F.IXD
c/n 15 OK-AFF crashed 11.9.1937
c/n 16 OK-AFG later taken to Germany as D-AAFG 21.4.1939
Some (one?) of the F.IX were later converted to a civil airliner as well F.IXD. I have only one civil registrations
OK-AFH c/n 12
Note OK-AMR c/n 9 was only a temporary registration and this aircraft reverted back to the Air Force again.
Two Fokker F.IX were license built by Avia as F.39 and sold to Yugoslavia. No c/n known (again by deduction were between 1-14) but they were serialled:
F.39.101
F.39.102
One of these was destroyed in April 1941 while the other went to Croatia as 1801
Incidentally Croatia also received one former Avia built F.IX from Germany during the Spring of 1942 listed as serial 1952 (rather oddly).
All this means Luftwaffe only used Avia built F.IX and there are plenty to chose from...
Cheers
Stig