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:
Asiatic International Airways
Silkair (until 1992 known as Tradewinds Charters)
Singapore Airlines

Corporations:
Airtrust Singapore (division of Orient Pacific Airways; flew engineers between oil drilling sites)
Tri-9 Corporation