What starts out as questionable practice pushed by EU operators for economic purposes can easily become a global nightmare.
1) EU operators didn't push for this. Captain Dieter Harms IATA Senior Advisor was the driving force
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2) MPL was NEVER for 'economic purposes'. The intent was for a competency based program that would be more efficient in terms of timeframe. Experience to date indicates an MPL programme is more expensive than the traditional route.
As to your global nightmare comment........