'Witchcraft' is c/s for Flugdienst Fehlhaber Gmbh of Neustadt, Germany, ICAO code FFG. I have seen their Cessna F406 Caravan II 's at Prestwick.
'Frog-Line' is c/s for Frosch Touristik Gmbh of Munich, Germany, ICAO code FTI.
(info from ICAO code book)
[This message has been edited by Eric T Cartman (edited 01 July 2000).]