You can't just simply schedule in WMIRS and then show up ready to fly.
There are plenty of places where this is all worked out well in advance, aircraft are at public airports with no special access
needed, Keys are in a combo box or with the FBO, and yes, in fact, you can just schedule the aircraft through the national
scheduling system and go flying (obviously you need a release). POCs are expected to be checking their emails and WMIRS
and be aware of who and when the plan has been reserved.
The process however, is decidedly local, with some wings still allowing POCs to require a ritual sacrifice, 3 forms of ID (and the pilot has to be tracker-chipped),
with advance notice in excess of 2 fiscal years, but that's
not how it's supposed to work.