Our club uses ScheduleMaster. We like it a lot, but it's expensive. We
looked at MyFBO.com which is cheaper and seems to have more features, but
from my experience with their on-line demo, their user interface sucks
rocks. There doesn't appear any way to see a complete overview of what
planes are available over a time period - you can only look at the
schedule for one plane at a time.

We use MyFBO, and I'll grant that their interface isn't top-notch. But you
most certainly CAN get an overview of all planes over a given time frame.