K + W (Switzerland)
- K + W Häfeli DH-2
- K + W Häfeli DH-3
- K + W Häfeli DH-5
KAI (Estonia)
- Kai PON-1
KALININ (Ussr / Russia)
- Kalinin K-1
- Kalinin K-2
- Kalinin K-3
- Kalinin K-4
- Kalinin K-9
- Kalinin K-5
- Kalinin K-7
- Kalinin K-12 Zhar Ptitsa
KARHUMÄKI (Finland)
- Karhumäki Viri
KAWANISHI (Japan)
- Kawanishi K-11
- Kawanishi E7K Alf
- Kawanishi H6K Mavis
- Kawanishi H8K Emily
- Kawanishi E15K Shiun / Norm
- Kawanishi N1K-J Shiden / George
- Kawanishi N1K Kyofu / Rex
KAWASAKI (Japan)
- Kawasaki T-4
- Kawasaki KDA-3
- Kawasaki Ki-5
- Kawasaki KDA-5 / Type 92
- Kawasaki Ki-3
- Kawasaki Ki-10 Perry / Type 95
- Kawasaki Ki-28
- Kawasaki Ki-32 MARY
- Nakajima Ki-19
- Kawasaki Ki-45 Toryu / NICK
- Kawasaki Ki-48 LILY
- Kawasaki Ki-56 THALIA
- Kawasaki Ki-60
- Kawasaki Ki-61 Hien / TONY
- Kawasaki Ki-66
- Kawasaki Ki-78
- Kawasaki Ki-64 ROB
- Kawasaki Ki-96
- Kawasaki Ki-102 Randy
- Kawasaki Ki-108
- Kawasaki Ki-100
- Kawasaki C-1
KAZAN AVIATION INSTITUTE (Ussr / Russia)
- Kazan Aviation Institute UPB
KAZYANENKO (Ussr / Russia)
- Kazyanenko No 5
KEISERLICHT WERFT (Germany)
- Keiserlicht Werft W.II
KELLNER-BECHEREAU (France)
- Kellner-Bechereau UD
KENNEDY (United Kingdom)
- Kennedy Giant
KEYSTONE (Usa)
- Keystone LB-6
- Huff-Daland XLB-1
- Huff-Daland XLB-3
- Keystone B-3
- Keystone B-5
- Keystone B-6
- Keystone XNK-1 Pup
- Keystone Pronto
- Keystone Pathfinder
- Keystone Patrician
- Keystone Sign-Carrier
- Keystone-Loening Commuter
- Keystone XB-1 Super Cyclops
- Keystone B-4
KHAI (Ussr / Russia)
- KhAI-19
- KhAI (Nyeman) KhAI-1
KIMBALL (Usa)
- Kimball McCulloccoupe
- Kimball Model 15 Raptor
- Kimball (Pitts) Model 12
KINGSFORD SMITH (Australia)
- Kingsford Smith KS.3 Cropmaster
- Kingsford Smith PL.7
KINNER (Usa)
- Kinner Sportwing
- Kinner Courier
- Kinner Sportster
- Kinner Playboy
- Kinner Envoy
KIRKHAM (Usa)
- Kirkham-Williams Mercury
KJELLER (Norway)
- Kjeller FF 6 (T.2)
KLEMM (Germany)
- Klemm KI 35
- Klemm L 25
- Klemm KI 33
- Klemm KI 36
- Klemm KI 105
- Klemm Kl.107 / MBB Bo.207
KLS (Usa)
- KLS SUA-7
KNOLLER (Austria)
- Knoller 70.01
KOCHERIGIN (Ussr / Russia)
- Kocherigin SR
- Kocherigin R-9
- Kocherigin BSh-1
- Kocherigin DI-6
KOECHLIN (France)
- Koechlin
KOKUSAI (Japan)
- Kokusai Ki-59 THERESA
- Kokusai Ki-76 STELLA
- Kobe Te-Go
- Kokusai Ku-7
- Kokusai Ku 8-II
- Kokusai Ki-105
- Kokusai Ta-Go
KOLB (Usa)
- Kolb Firestar
- Kolb Firefly
- Kolb Kolbra
- Kolb Mark III Extra
- Kolb Sling Shot
KOMTA (Ussr / Russia)
- KOMTA
KONDOR (Germany)
- Kondor Dreidecker
- Kondor D 1
- Kondor D 2
- Kondor D 6
- Kondor D 7
- Kondor E 3 (D I)
KOOLHOVEN (Holland)
- Koolhoven FK 41
- Koolhoven FK 43
- Koolhoven FK 51
- Koolhoven FK 52
- Koolhoven FK 58
- Koolhoven FK 55
- Koolhoven FK 50
KORSA (Switzerland)
- Korsa T.2
KORVIN (Ussr / Russia)
- Korvin MK-1 Rybka
KREUTZER (Usa)
- Kreutzer K-5 Air Coach
KYUSHU (Japan)
- Kyushu K11W Shiragiku
- Kyushu Q1W Tokai / LORNA
- Kyushu J7W Shinden