Uppercu-Burnelli - X398N
Udet U 12b Flamingo (Spezial) - D-822 - (see also Bayerische Flugzeugwerke)
Uetz U2V - HB-SVM
Ullrich Auriga FT - N512EA
Ultimate
     10-180 - C-FGYD
     10-200 - OY-CMP
     20-300S - N8UB
Ultracraft
     Calypso 1a - OO-D36
     Calypso 2a - OO-E22
Ultraflight Lazair SS EC - N911MP
Ultralair Weedhopper AX3 - OO-B30
Ultralight Aviation SkyDart SD-2 - 19-4286
Ultravia
     Pélican PL - C-FWQI - PH-VKL
     Pélican PL914 - C-FZMY - C-GDAD
Umbaugh 18 - CF-SIU - N106U - (see also Air & Space and Fairchild U-18)
Union-Flugzeugwerke Wasserdoppeldecker - German Navy: 73, photo
United Consultants UC-1 Twin Bee - N87589
United Helicopters UH-4 Commuter - NX68276
Unknown types - photos
Upson Kite Balloon - USASC: "24"
Urban Air
     UFM-10 Samba - OK-EUU-38
     Samba XXL - OK-JUA-03
Usuelli T-34 Roma - USAAS: photo
Utva
     65 - YU-BCK
     66 - C-FMIG - C-GEQV - N404RC
     75 - YU-DEW
     Aero-3 - Yugoslav AF: 40101 - YU-CYB