Take the chaos that has engulfed Brazil's airports for the past six months, the result of a creaking air-traffic control system operated by disgruntled air-force staff.
In addition to the 168 towers to be closed April 1, some 16 towers that are operated on a cost-sharing basis with other governments, and five operated with the Air National Guard, will be closed Sept. 30.
The condition of the three crew members on the Twin Otter operated by Calgary-based Kenn Borek Air Ltd. was not known nearly three days after the flight went missing and rescue attempts began.
The aircraft was operated by the Edinburgh Air Charter company and was taking staff from Lancashire-based Airtours to Aberdeen to connect with a holiday flight to Majorca.
That date is significant, of course, since it was the day when six Arizona-based Muslim clerics were removed in Minneapolis from an aircraft operated by US Air.
Planes operated under visual flight rules -- rules that require only limited contact with air traffic controllers -- were grounded along with commercial aircraft in the hours immediately following the hijackings.