But even better, let Railway Media rent the unit in major airports before the flight. Now we get rentals for short flights since we add 30-40 wait time before the flight plus the open door time waiting to leave the gate. It may even get some use while waiting to pick up luggage. 
The ideal return location is near the baggage pickup. The return location could be automatic with a bit of thought using serial number bar card signed out to specific credit card numbers.
EXACTLY ... then go one step further and have an option to keep the eVU  until the return flight.