HyTES, led by Principal Investigator Dr. Simon Hook of NASA’s Jet Propulsion Laboratory, successfully completed its first test flights on board a Twin Otter aircraft flown between Grand Junction, Colorado and Burbank, California the week of July 16, 2012. Initial engineering data were acquired near Grand Junction. Based on an evaluation of those datasets, science datasets were acquired between Grand Junction and Burbank. They include acquisitions over different surface types and gas emissions (sulfur dioxide, methane, ammonia) to determine whether HyTES can be used for gas studies.