"Boeing 737 Max 8 pilots complained of suspected safety flaw months before Ethiopian Airlines crash....Records show a captain who flies the Max 8 complained in November that it was "unconscionable" that the company and federal authorities allowed pilots to fly the planes without adequate training or fully disclosing information about how its systems differed..."
https://www.philly.com/business/boeing-max-pilots-complained-suspected-safety-flaw-20190312.html