A few months after the Yellowstone Supervolcano had erupted, the US Geological Survey organized an overflight of the crater. While most US commercial aviation was still grounded due to ash in the air, the USGS managed to charter a Learjet for the mission. The aircraft carried a number of geology professors and their graduate students including Prof. Geoff Rheinburg and his student Kelly Birnbaum along with sensors and other equipment to analyze the crater.