Kaiser-Fleetwings
Kaiser-Fleetwings A-39
Kaiser-Fleetwings BTK

Kalinin
Kalinin K-7

Kaman
Kaman HOK
Kaman HUK
Kaman HU2K Seasprite
Kaman K-1200 K-Max
Kaman SH-2 Seasprite.

Kamov
Kamov Ka-15
Kamov Ka-18
Kamov Ka-20
Kamov Ka-22 Vintokryl
Kamov Ka-25
Kamov Ka-26
Kamov Ka-27
Kamov Ka-28
Kamov Ka-29
Kamov Ka-32
Kamov Ka-37
Kamov Ka-50
Kamov Ka-52
Kamov Ka-115
Kamov Ka-226

Kawanishi
Kawanishi E15K Shiun
Kawanishi E7K
Kawanishi H6K
Kawanishi H8K
Kawanishi N1K Kyofu
Kawanishi N1K-J Shiden

Kawasaki
Kawasaki C-1
Kawasaki KDA-5
Kawasaki KH-4
Kawasaki KH-500E
Kawasaki Ki-10
Kawasaki Ki-32
Kawasaki Ki-45 Toryu
Kawasaki Ki-48
Kawasaki Ki-56
Kawasaki Ki-60
Kawasaki Ki-61 Hien
Kawasaki Ki-64
Kawasaki Ki-66
Kawasaki Ki-78
Kawasaki Ki-96
Kawasaki Ki-100
Kawasaki Ki-102
Kawasaki Ki-108
Kawasaki OH-X
Kawasaki T-4
Kawasaki P-2J

Kayaba
Kayaba Heliplane
Kayaba Ka-1

Kellet
Kellet KD-1

Kestrel
Kestrel K250

Keystone Aircraft Corporation
Zie ook Huff-Daland
Keystone B-3
Keystone B-4
Keystone B-5
Keystone B-6
Keystone Puffer

Kirby
Kirby Cadet

Klemm
Klemm Kl 31
Klemm Kl 32
Klemm Kl 35
Klemm Kl 36

Kokusai
Kokusai Ki-59
Kokusai Ki-76
Kokusai Ki-86A

Kondor
Kondor D.VI
Kondor E.III

Koolhoven
F.K.23 Bantam
F.K.24 Baboon
F.K.26
Koolhoven F.K. 30 Toerist
Koolhoven F.K. 40
Koolhoven F.K. 41
Koolhoven F.K. 42
Koolhoven F.K. 43
Koolhoven F.K. 44
Koolhoven F.K. 45
Koolhoven F.K. 46
Koolhoven F.K. 47
Koolhoven F.K. 48
Koolhoven F.K. 49 / F.K. 49A
Koolhoven F.K. 50 / F.K. 50A / F.K. 50B
Koolhoven F.K. 51
Koolhoven F.K. 52
Koolhoven F.K. 53 Junior
Koolhoven F.K. 54
Koolhoven F.K. 55
Koolhoven F.K. 56
Koolhoven F.K. 57
Koolhoven F.K. 58
Koolhoven F.K. 59

Kreider-Reisner
Kreider-Reisner C-31

Kreit-Lambrickx
Kreit-Lambrickx KL-2

Kyushu Hikoki
Kyushu J7W Shinden
Kyushu K11W Shiragiku
Kyushu Q1W Tokai