The following submission statement was provided by /u/mancinedinburgh:

I’m still not convinced of the merits of hydrogen as an effective, eco-friendly fuel source but could it be any worse than the current fuel used by long haul carriers to fly aircraft halfway across the world? We’re moving towards futuristic aircraft like this (perhaps not for several decades) but by the time it’s in service, we may have found a better fuel source.

Please reply to OP's comment here: https://old.reddit.com/r/Futurology/comments/124snr0/the_swiss_hypersonic_hydrogen_jet_aiming_to_fly/je0l9z4/