It will need new airframes and new cryo infrastructure, which is why it has been slow to happen. Once it does, building out will take a long time. But the competitive benefits are big enough to move a lot of activity.

In the meantime, we will need synthetic hydrocarbons, using captured carbon, for extant airframes. It will need to get (or be made, through carbon taxes) cheaper than the mined, refined, and transported stuff.

Having a big hydrogen synthesis infrastructure in place feeding hydrocarbon synthesis will then ease the transition off of hydrocarbons, as equipment that can use hydrogen directly comes online. Stationary uses will come first, displacing natural gas electric generation.