If you're curious, a press release from yesterday had more details:
"This time around, we plan to trying climbing to 16 feet (5 meters) in this flight test. Then, after the helicopter hovers briefly, it will go into a slight tilt and move sideways for 7 feet (2 meters). Then Ingenuity will come to a stop, hover in place, and make turns to point its color camera in different directions before heading back to the center of the airfield to land."
"The letters I and X are not currently used as the first letter of any ICAO identifier, and the letter J is only used in a ceremonial ICAO identifier granted to Jezero Crater on the planet Mars, JZRO."
Did they just set a precedent for J as the Mars prefix?
Yep. Nothing more permanent then temporary and all that - when Mars needs another airfield area, someone's going to Google for guidance, see that J and go "well, let's be consistent..."
"This time around, we plan to trying climbing to 16 feet (5 meters) in this flight test. Then, after the helicopter hovers briefly, it will go into a slight tilt and move sideways for 7 feet (2 meters). Then Ingenuity will come to a stop, hover in place, and make turns to point its color camera in different directions before heading back to the center of the airfield to land."
via https://mars.nasa.gov/technology/helicopter/status/294/were-...