Without getting too chummy the U.S. and Iran have been trying to work out some rules for each other’s use of UAVs now operating over Iraq. Iranian UAVs have been seen flying over Iraq since late June, apparently with the approval of the Iraqi government (and quiet assent of the Americans, who already had F-16s and UAVs over Iraq). Between the U.S. and Iran there are often fifty or more UAV sorties over Iraq on some days. While Iraq is a big place, the UAVs from each country will often be seeking pictures of the same area at the same time. There have been no UAV collisions and few sightings by each other’s UAVs.
Apparently the two nations have quietly agreed to leave each others UAVs to go about their business of supporting the Iraqi government in its fight against advancing ISIL Islamic terrorists. It’s unclear if there has been any sharing of information.