The thing is that Syria is, de facto, not one country. Striking targets in different locations requires completely different capabilities, and the US usually targets eastern Syria, while Israel usually targets western Syria or (as of recently) Lebanon.

Just the other day US Air Force has allegedly done a bombing run on some Iran-supported forces - but with ADS-B enabled! I mean what we do know for sure is that there was a bombing run, and at the same time there were appropriate USAF aircraft in the air with ADS-B visible on flightradar24 and other such websites.