From the Washington Post:
“France and Turkey, in turn, have pushed to establish a no-fly and buffer zone to protect refugees in northern Syria, an idea opposed by the United States, Germany and others. No country in the coalition is eager to send ground troops to Iraq or Syria, despite a shortage of reliable proxy forces in either country to fight the Islamic State head-to-head.”

Why would Turkey want a no-fly zone?  ISIS has no planes.  Turkey and France have been pushing for the no fly zone since 2011.  Turkey thought this would limit Syria’s military options, allowing the Turkish-allied Muslim Brotherhood in Syria to take over the government, which would in turn limit the Kurdish drive for sovereignty.  It hasn’t turned out that way, but Turkey hasn’t shifted its strategy.