It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
Airshows planes bombers marines wings smoke. en br Image title Airshows planes bombers marines wings smoke Image from Public domain images website publicdomainimage html publicdomainimage Jon Sullivan Not given Transferred by on This file is in public domain not copyrighted no rights reserved free for any use You can use this
Page 2017 Free-images.com. All images are Public Domain