Flying weight
Doesn't the residual liquid have to be kept after hydrogen release? This poses the same issues as hydride storage, that is additional weight has to be carried for the full fueling cycle, versus a normal fully consumed fuel. Plus I would assume recharging cannot be done instantaneously, which would mean almost doubling fueling time - remove the depleted liquid and replace with the fresh. That could pose an issue (and environmental inpact) for plane turnaround, no?