The Netherlands & White Helmets have responded favorably to Turkey’s call for a no fly zone in Idlib although most NATO members have thus far given the cold shoulder to Turkey’s proposal. The problem is that Syria has already called a no fly zone for the area & will try to enforce it with Iranian ground forces & Russian bombers even though Turkey has been operating with what appears to be Russian permissiveness, or at least lack of resistance.
A militarist solution should not be what first leaps to mind in defense of the Syrian Arab Spring. Before calling for a no fly zone, it might be more effective & politically advanced to call for international protests demanding the cessation of bombing since polls show the majority of people oppose foreign military intervention in Syria. To build a movement, the demand would have to be for a cessation of all bombing since you cannot build a social movement that endorses bombing that would kill civilians unless you organize among fascists.