But the real deadline is typically a week or two before, as it takes most providers a week or two to setup the plan for launch.

FORBES: Why this is the year to start your small business 401(k) before the September deadline

The benefits of grounding planes to halt disease were unclear, but "flight limitations might slow the spread of pandemic influenza by several weeks, thereby providing time for mass vaccination of the population and contingency plan setup, " the researchers wrote.

BBC: In-flight health issues 'on rise'

To setup up a Safe Harbor 401(k) plan for 2012, the business must have their plan set up by October 1st by law.

FORBES: Why this is the year to start your small business 401(k) before the September deadline