Had a ride out of Hilo in 93, in an Astar. Great flight, music thru the headset, but couldn't talk back to the driver. Hovered low over plastic flows, could see the red glow from inside. Saw the vent into the sea.
Hovered on the edge of the rim, but appeared as though we could have pedalled out of the way and gained speed on the safe side if anything went wrong.
I believe the rules have tightened up on volcano flights. Somebody out there must have more current knowledge?