During a scathing Congressional and federal investigation, it was revealed that Boeing pushed engineers and regulators to approve that jet under the older 737 Model certificate to avoid paying penalties to airline customers for any extra required training for pilots. Boeing was forced to pay $2.5 billion in penalties for its role in deceiving regulators and airlines and as compensation to family members of victims. In September, Boeing was fined $200 million by financial regulators for deceiving investors.