Here You can find a list of airlines which operated in Mannheim airport.
Nice - Millon Express
Innsbruck - Millon Express
Istanbul Atatürk - Millon Express
Bremen - Millon Express
Dortmund - Millon Express
Köln Bonn - Millon Express
Saarbrücken - Millon Express
Sylt - Millon Express, Flexflight