One-way trips extremely difficult

Zipcar makes a big deal of allowing one-way trips between DC and Baltimore, yet their app doesnt allow bookings between the cities. Each time I select Baltimore as a destination from DC, the app shouts Woah, cool trip! We havent made it there yet. It would be a cool trip if I could actually book it! The app has not been updated since June. Its difficult to use a service for its intended purpose when the app prevents it. Really poor.

Andy123dc about Zipcar: cars on-demand, v4.0.14