Doing nothing may be politically safe but it is not a cheap option.

ECONOMIST: Drugs

American Airlines and any other company that can't fulfill its core mission on a regular basis, whether it's safe and efficient airline travel or safe peanut butter or cynanide-free Tylenol, may not be long for this world.

CNN: How would you save American Airlines?

Mr Francis said the scandal, in which at least 400 patients may have died unnecessarily, was not an event of "such rarity or improbability that it would be safe to assume that it will not be repeated".

BBC: Families plan legal action over care