Automobile rental: visible damage, invisible damage, wear and tear, tolls, tickets, hit-and-run accidents on five-year-olds... Invisible damage and wear-and-tear are priced in, everything else is laid squarely at the feet of the renter by the rental company, often with punitive fees attached.
Flightcar: ha ha ha ha ha ha ha it's all on you, for $10/day.
And there's no easy way they can actually put those things back on the renter where they belong. This automobile owner doesn't know it yet, but the same renter who blew through the tolls on the Golden Gate also racked up 12 parking tickets for parking next to a fire hydrant, which he crumpled up and threw away... It'll be a nice surprise when he tries to renew his registration two years from now.