Seems like it would be awfully easy to track any planes coming from Iran to Syria.
Israel has been tracking and there has been a major uptick in flights from Iran to their airbases in Syria hence the warning.
Not necessarily.
Iran has went into production of a knock off of the Lockheed RQ-170 stealth drone Obama gifted them, including a version reconfigured for use as a stealth cruise missile
The Iranian RQ-170 was recently shot down while being tested over Israel.
It proved to be a difficult target to hit by intercepting aircraft.