In congested hubs, you have more that just Slots to worry about.
The availability of gates of the right size for the fleet type of scheduled flights can be a real scheduling constraint. Manage this in real-time as you make your schedule edits using the integrated Gating module.
Zulu has an integrated Gating module that allows you to visualize the gating for a schedule and interactively plan the best solution. Rules for ready time, towing time, gate specifications, etc. are customizable.