<p>Last year, thousands of JetBlue Airways passengers became unwitting participants in a highly unusual test of pilot fatigue.</p>
<p>Without seeking approval from Federal Aviation Administration headquarters, consultants for JetBlue outfitted a small number of pilots with devices to measure alertness. Operating on a green light from lower-level FAA officials, management assigned the crews to work longer shifts in the cockpit -- as many as 10 to 11 hours a day -- than the eight hours the government allows. Their hope: Showing that pilots could safely fly far longer without exhibiting ill effects from fatigue.</p>