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    AUSTRIA-HUNGARY

  1. UFAG

  2. CANADA

  3. ULTIMATE
  4. ULTIMATE AEROBATICS
  5. ULTRA-FLIGHT
  6. ULTRAVIA
  7. UTIAS

  8. COLOMBIA

  9. URDANETA

  10. CZECH REPUBLIC

  11. URBAN

  12. GERMANY

  13. UDET
  14. ULBI
  15. UNION
  16. URSINUS

  17. ISRAEL

  18. URBANAERO

  19. ITALY

  20. UMBRA

  21. PHILIPPINES

  22. UDRD

  23. ROMANIA

  24. URMV-3

  25. RUSSIA

  26. UAC
  27. UAIK
  28. UFIMTSEV
  29. UNIKOMTRANSO
  30. UUAP

  31. SWITZERLAND

  32. UETZ

  33. UNITED KINGDOM

  34. UAT
  35. URMSTON

  36. UNITED STATES

  37. UCC
  38. UFM
  39. ULLMANN
  40. UMBAUGH
  41. UNITED
  42. UNITED AIRCRAFT
  43. UNITED EASTERN
  44. UNITED HELICOPTER
  45. UNITED STATES
  46. UNITED TECHNICAL INDUSTRIES
  47. UNIVAIR
  48. UNIVERSAL MOLDED PRODUCTS
  49. UNRUH
  50. USAC
  51. US LIGHT AIRCRAFT

  52. YUGOSLAVIA

  53. UTVA