One has to remember that when there was the big launch of JMC referred to above, JMC was 50.1% owned by Preussag. The name (and delighful colour scheme) were chosen in conjunction with Preussag too.
Since then of course, JMC have been purchased 100% by what was Condor Neckermann, who I guess rightly have recognised the well known brand is actually better than the new one!
Now that Thomson/Britannia is owned by Preussag, we have the fun of a new (naff?) colour scheme and living in The World of Tui (yes TWOT for short!) so it will be all change for both Thomson and JMC in the next year.
Rumour has it the JMC name could go altogether and all the TC group airlines will be Thomas Cook Airlines, give it 3 years and the Britannia/Hapag/Corsair names will probably have gone the same way! and we'll all end up as Tui Airways.