If you are willing to do the necessary investment, I think there is huge potential to build an airplane that goes significantly further then planes like the Aviation Alice or what Heart Aerospace ES-30 is doing.
Many industry experts believe we're going to see an electrification but in tiers. Pure electric in the regional space, with more regional options than now on smaller planes, followed by hydrogen or alternative fuels powering the mid-range. Long range may go to hydrogen or alternatives, but the density is still such that jet fuel will rein on the longest flights for the next 10-15 years minimum.
The ES-30 flying from Zürich can get you to important cities in France, Germany, Italy and Austria. With they hybrid mode almost to Paris.
In Europe you have great trains but in the US this could be a game changer in all the big metro areas, North East, Florida, Texas Triangle, Southern California, Mid West/Canada.
Pushing on that whole stack you can get out more then the ES-30. There is potential for things like flying higher, using PRANTL Wing, Flying wing structure, batteries as part of the structure and so on.
A startup wouldn't risk doing any of these, but a company like SpaceX/Tesla could easily invest the capital to do this.