U.S. defense department spokesman said that a military activity by Turkey along its border with Syria was not provocative.
Replying to questions at a daily press briefing, Spokesman John Kirby said that they knew military activity on the Turkish-Syrian border.
There was no reason to believe that Turkish military buildup on its border with Syria was provocative, he said.
The unarmed Turkish plane was shot down by Syria while on a training and test mission after unintentionally strayed into Syrian airspace but it was quickly warned by Turkish authorities to leave.
The incident has drawn widespread condemnation amid the continuing violence in Syria.
Turkey said the Syrian act constituted a violation of international law and that Ankara would take "every necessary measure."