Probably just fans, but I don't know.
Much more detail about the 2 passengers, who were the reason that we asked the KLM flight to turn around and didn't allow it over our airspace.
Mystery Flight
Two passengers trigger alarms—and fresh echoes of 9/11.
http://msnbc.msn.com/id/7529185/site/newsweek/
Fifteen minutes after KLM Flight 685 took off from Amsterdam for Mexico City on April 8, Mexican authorities forwarded the names of all the passengers to the U.S. Department of Homeland Security. The reason: the flight was scheduled to pass through U.S. airspace after making a long swing over Canada. The information was then passed on to the U.S. National Targeting Center, based at a secret address in the Virginia suburbs of Washington, D.C. That's when the routine became extraordinary: by the time the Boeing 747 had finished its three-hour crossing of the Atlantic, Homeland Security screeners were on high alert. The names of two Saudi passengers aboard the KLM flight had begun producing "hits" on the screening center's lists of 70,000 suspect foreigners.
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Other intelligence officials say if the two were indeed part of a Qaeda operation, it is no surprise their destination was Mexico City. U.S. officials fear that Latin America, and more particularly Mexico—with its porous U.S. border—may become a staging ground for Al Qaeda.