Once again, Flightradar24.com provides an insight into military operations. This time, the Russian air bridge to Syria.

Some days ago we explained how everyone (including low-tech terrorists "armed" with a mobile device and an Internet connection), could have the operational equivalent of a ground-based radar detection system to predict (and avoid) U.S. airstrikes and reconnaissance missions thanks to ADS-B, Multilateration, online tracking systems and some poor OPSEC procedures.

However, American and NATO planes are not the only ones that can be tracked on the Internet: there is a widespread tendency to leave the transponder turned on while flying close or inside sensitive areas.

For instance, in the last few days, Flightradar24 exposed the Russian military airlift from Sevastopol, in Crimea, and other bases in Russia to Syria.

On Sept. 7, two A124 Condor airlifter could be tracked until landing at Latakia, Syria.

RFF8058 (82040) from Krymsk and RFF8056 (82039) from Mozdok A124s both landed it Latakia, Syria today

— Nick (@MIL_Radar) 7 September 2015

On Sept. 9, aviation enthusiasts from all around the world tracked as much as five An-124 Condor airlifters heading towards Syria. An additional one could be tracked on Sept. 10.

Russian #Airforce An-124 82035 enroute Mozdok from Latakia in Syria. Apparently via Turkmenistan. Azerbaijan closed? https://t.co/g52ri94jmF — Missilito (@Missilito) 10 September 2015

Unlike the flights tracked on the previous days, the six cargo planes spotted on Sept. 9 and 10 took an easterly roundabout route to avoid the airspaces of Turkey, Greece, Bulgaria and Cyprus, closed to Russian aircraft supporting the military buildup in Syria.

According to several sources, at least four aircraft went through Iran/Iraq.

An-124 on roundabout route Sept. 10

Interestingly, aviation enthusiasts monitored also some Syrian Air flights of IL-76 carrying registration YK-ATA that, on Aug 22 and 28, made roundtrip flights from Latakia to Moscow on the easterly Iran/Iraq route.

Syrian IL-76T [YK-ATA] cargo aircraft returning to Syria [Latakia] after a round trip to Moscow Vnukovo #FR24 http://pic.twitter.com/ZsdwYjMPdN

— Missilito (@Missilito) 28 August 2015

Not only are An-124s flown to Syria lately. Other Russian flights from Russia to Syria include an Il-62, RA-86496, and EMERCOM (Russian Ministry for Emergency Situations) Il-76, RA-76429: the first one visited Latakia on Aug. 12, 28 and on Sept. 7, using a route via Bulgaria, and on Sept. 10, using a route via Belarus – Poland – Serbia that avoided closed airspaces.