Wheeled vehicles have lots of opportunities for braking, but airplanes and boats not so much, so even if you could do regenerative braking (which you probably can't) it'd not be enough to be worth doing. It's a loss compared to wheeled EVs of 30%-50%.

And then airplanes typically need to be lighter when landing than when taking off, and jet fuel has the nice properties that a) as you use it up what you've left weighs less, b) you can toss enough jet fuel to get to landing weight if need be. Batteries have neither of those properties, which means that electric airplanes would have to be built much sturdier (i.e., heavier, therefore more expensive and less efficient) to handle heavy landings, or would have to carry less cargo / fewer passengers per unit of stored energy (i.e., less efficient).

I'm afraid that no matter how good wheeled EVs get, it's going to require a whole new kind of battery before you can ever get to practical. large electric airplanes.