Over the past 13 months, at least 68 cargo flights from Serbia, Slovakia, Bulgaria and Czech Republic have carried thousands of tons of munitions to Saudi Arabia, the United Arab Emirates (UAE) and Jordan, three key suppliers of the Syrian rebels.
Of the 68 flights identified, 50 were officially confirmed to have carried arms and ammunition. An additional 18 flights were identified as very likely to have been carrying arms and ammunition based on one of three variables: the air freight company’s history of weapons supplies; connections to earlier arms flights; or a destination of a military airport.
Table explanation
-  Flight confirmed as carrying arms and/or ammunition by the Civil Aviation Directorate of Serbia
-  Flight by TransAVIAexport Airlines which has a history of transporting arms and ammunition and an identical flight number to an earlier flight confirmed to be transporting arms and/or ammunition by the Civil Aviation Directorate of Serbia
-  Flight by Jordan International Air Cargo which has a history of transporting arms and ammunition as part of Syria program
-  Flight confirmed as carrying arms and/or ammunition by official at Bulgarian National Customs Agency
-  Flights to military bases in Saudi Arabia and United Arab Emirates, indicating the likely presence of arms and/or ammunition
- Highlighted: Photographs, taken or obtained by BIRN and OCCRP, of military boxes being loaded onto planes.
Sources: Serbia's Civil Aviation Directorate, airport timetables, cargo carrier history, flight tracking data, leaked arms contracts and end users certificates and air traffic control sources.