The Natural Philosopher wrote:

Actually, with hydrogen, it isnt.

Its BULKY. Light but BULKY. that makes it unsuitable for aircraft. Too
much tank, too much drag.

There are ways around that. The passengers won't like them though. The
Skylon shows how you can do it. Push the engines to the ends of the
wings, fill the fuselage with fuel and do away with the pilots. Sit the
passengers in a module in the centre of the aircraft without any
windows. Oh and get back to the days of charging several ordinary annual
salaries for a single trip across the Atlantic.