FAA doesn't bother with suspension - goes straight for the revocation:

http://www.nytimes.com/2009/10/28/us/28plane.html

Pretty harsh for pilots who don't appear to have had any other blemish on
their lengthy records.

Revocation would seem to be appropriate for actions that are deliberately
reckless or are likely to be repeated. This wasn't deliberate and would
certainly not be repeated by these pilots. So why why not suspend their
certificates for a year or so? My guess is that wasn't done because the
mistake was too high profile, publicity-wise.