I would expect to be a scaling point past which choosing gasoline over batteries becomes more efficient. Maybe common electric flying vehicles have not reached that size point yet.
I think that it is not a size point but an endurance point. A camera drone can be useful even with just five minutes on a single battery pack (your audience might actually be grateful if those overhead takes are less endless ;)). But a big commercial liner that has to be in final approach after only five minutes in the air would be very, very pointless.