What plane cost less per mile to operate for one person?
No plane has these qualities, planes require a lot more servicing than cars both legally and practically. Similarly aircraft parts have service limits and heavily suggested rebuild times. Most if not all light aircraft require major servicing (or receive major servicing) at the 2000-2500ish hour mark.
There are comparatively little regulations on car maintenance. Most states require only a yearly inspection that boils down to a visual check of brakes, lights and a few other things as well as an emissions test mostly to keep the DEP happy.
Aircraft on the other hand require a verbose yearly &quot;annual&quot; inspection that can take days for a mechanic to complete. On top of that aircraft equipment needs to be routinely tested and checked for it to be legal for certain types of operation. On the contrary no one ever checks your cars speedometer or tach for proper operation.
Broadly speaking aircraft are also grounded if just about anything is not working where as most people often operate their car with small (or even large) issues. If you ever had an engine knocking issue in an aircraft you would be on the ground as fast as practically possible where as I know people that have driven cars thousands of miles with an &quot;engine knock&quot;.
Airplanes also change substantially less than cars so small iterative fixes become difficult. If Toyota finds an issue in the 98 Corolla they can easily fix it in the 99 version. Fixing an airplane can require a lot of paper work, or if its a large issue an mandatory AD may be issued and everyone will be forced to fix it while 98 Corollas may still be out with their issues to this day.

If you just want a straight answer... A Piper Archer or a Cessna 172 (let the internet debates begin...)