What altitude block is typically requested for Clearance and Delivery?

The 1,000 ft block is typically requested for Clearance and Delivery because it provides a manageable and standardized altitude separation for aircraft. This altitude block reduces the complexity of air traffic control when it comes to coordinating departures and arrivals. By using a 1,000 ft block, it allows pilots to easily transition from tower-controlled operations to enroute flight while maintaining safe vertical separation from other traffic.

Additionally, the 1,000 ft increment aligns with normal aircraft operational practices in the National Airspace System, which helps facilitate smoother traffic flow. This standardized approach enhances communication between pilots and air traffic controllers, ensuring clarity in altitude assignments and maintaining safety in busy airspace.