HOUSTON (AP) — Federal Aviation Administration authorities say air traffic controllers at a Houston airport averted a potential midair collision of two planes.

The incident happened Thursday night 10 miles northeast of Bush Intercontinental Airport, when a Singapore Airlines 777 jumbo jet and Delta Airlines A320 came about a half-mile horizontally and about 200 feet vertically of each other. Federal guidelines say aircraft should be separated a half-mile vertically and three miles horizontally.