Airships for city hops could cut flying’s CO2 emissions by 90%
theguardian.com
theguardian.com
So whilst the figures for CO2 emission reduction might be true, it won't have a real impact until they can scale this up.
The Embraer 190, a good example of a short haul jet, with capacity for between 94 and 114 passengers.[1]
The blimp seems comparable.