Several radar upgrades at Los Angeles International Airport originally slated to be in place this year are months behind schedule. Air traffic controllers say the equipment is essential to prevent potential collisions on the ground. The FAA attributed the delays in the ASDE-X system at LAX to construction at other airports that required the agency to install the equipment at those facilities first. Ian Gregor, an FAA spokesman, emphasizes that the current runway safety equipment at LAX is not "insufficient in any way. Given the scope and complexity of what we're doing, it's inevitable that delays will occasionally occur."