Maersk and the Viking Energy project are developing the technology to use it in shipping as ammonia. The first hydrogen-fueled commercial passenger flight has a

Maersk and the Viking Energy project are developing the technology to use it in shipping as ammonia. The first hydrogen-fueled commercial passenger flight has already flown, and there are a number of conversions of existing aircraft happening. Airbus is also looking into it. I think for these types of applications, ammonia makes more sense, especially if you can get away with high temperature fuel cells that can use ammonia directly. For drones, hydrogen is proving to be better for aircraft needing long endurance, and is likely the future of the industry -- at least for platforms above a certain weight class.