Last month, two prominent flight control experts and whistleblowers — one ex-Boeing, one ex-FAA — delivered to the U.S. Senate committee overseeing aviation a technical proposal to upgrade Boeing’s 737 Max cockpit to current design standards. The system on the Max for alerting pilots about malfunctions during flight is outdated — and without an upgrade Boeing may need congressional action to extend the jet’s exemption from the latest safety regulation and get the upcoming final version of the Max into service. The proposed fix was offered as an alternative that all models of the Max could be r…