Which lights are primarily used to assist pilots with glide path during landings?

Visual Approach Slope Indicators (VASI) are primarily used to assist pilots with glide path during landings. These lights provide visual cues to help pilots align their aircraft with the correct descent angle towards the runway. The VASI system typically consists of a series of lights that indicate whether the aircraft is on the correct glide path, below it, or above it, which is crucial for safe and stable landings, particularly in various weather conditions and during nighttime operations.

Touchdown Zone Lights are used to enhance visibility of the runway's threshold; however, they do not provide guidance on the glide slope. Runway End Identifier Lights serve to mark the end of the runway but do not assist with glide path alignment. Centerline Lights indicate the center of the runway but are more focused on lateral positioning than vertical descent guidance. Consequently, VASI lights are the most relevant for helping pilots maintain the proper glide path during approach and landing.