What happens if you land an electric aeroplane at an airport that doesn't have a proper charge point (say as a precautionary emergency - passenger sick)? I guess you'd be stuck there for a while until somehow you find a way to get enough charge to fly out and make it to somewhere that does have a proper charge point.
The same as when your battery goes flat now, from what I read batteries are not integral and are "plug and play". So you can add/remove batteries to control range vs payload. Just roll up with a charged battery set and fly out, or possibly they can be charged from a normal socket in the wall albeit a much slower rate, which would just require the adapter and extension cord.