A list of aircraft operators that have that have suffered an accident, serious incident or hijacking. The list may also contain defunct airlines or airlines that in the meantime have changed their name or have merged.

Airlines:
CLS - Ceskoslovenská Letecká Spolecnost
CSA Ceskoslovenské Aerolinie (renamed CSA Czech Airlines in 1995)
CSA Czech Airlines (until 1995 known as CSA Ceskoslovenské Aerolinie)
Time Air
Travel Service Airlines
Van Air Europe

Flying schools, Aeroclubs, Skydiving:
ACM Praha
Ak Brno

Manufacturers:
Aero Vodochody
Let

Military:
Czechoslovak Air Force (continued as Czech Air Force and Slovak Air Force)

Private:
P. Elsner