Being Fairly Young - I havn't flown on that many defunct airlines but here is my list:
Air Scandic(MAN-HER)
Go!(EMA-PRG)
Britannia (MAN-HER/PMI)
JMC(MAN-Skiathos/Lesbos/Zante)
Excalibur (MAN-FAO Back in the 90's)
Air2000/First Choice(MAN-Preveza/MAH)
BA Citiexpress/BA Connect(LPL-IOM/MAN-TXL)