After I rebased an aircraft to TFFR, I realised it was an A340 instead of an A330, so I returned it to Paris. I was able to assign routes from LFPG to it, but the system maintained it was still TFFR based...
After rebasing again (from TFFR to LFPG) the game caught on...
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Will only be fixed after new UI page is introduced here.