In May 2014, for the second time in as many years, NASA researchers began taking to the skies with a DC-8 and other aircraft to conduct a series of flight tests designed to study the effects on emissions and contrail formation of burning alternative fuels in jet engines. And just like a good movie sequel, this year's Alternative Fuel Effects on Contrails and Cruise Emissions flight tests, known as ACCESS II for short, will feature a number of new plot twists to keep the research story interesting and moving forward. Among them are new science instruments, new flight profiles to follow and a decidedly new international flavor to the effort thanks to the direct participation of research aircraft and scientists from Germany and Canada.