The 16-hour flight typically leaves Tehran and stops at Damascus International Airport (DAM), which is Syria's busiest. In 2009, almost 4.5 million passengers used the airport.
After a 90-minute layover, the flight continues the remaining 14 hours to Venezuela's Caracas Maiquetía International Airport (CCS). Upon arrival, the plane is met by special Venezuelan forces and sequestered from other arrivals.
"It says that something secretive or clandestine is going on that they don't want the international community to know about," says Brookes, a former deputy assistant defense secretary for Asian and Pacific Affairs and CIA employee.
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