US federal authorities have flagged serious flaws in the crisis management strategies of the big four US banks - known as "living wills" - in a sign that they will push for stronger protection against financial turmoil. The Federal Deposit Insurance Corporation (FDIC) and the Federal Reserve announced that the plans of Bank of America, Citigroup, Goldman Sachs and JPMorgan Chase fell short of expectations and set a deadline for necessary revisions in 2025.