HOUSTON (KTRK) -- The Federal Aviation Administration is investigating a close call between two planes at George Bush Intercontinental Airport Thursday night.
The incident, according an FAA statement, occurred about 6:51p, about 10 miles northeast of the airport. The FAA says it's still investigating how close the two planes actually came to each other.
The FAA statement reads, "Preliminary information shows that the pilot of Singapore Airlines Flight 61 had been cleared to follow a standard departure procedure, which stipulates that the maximum allowed altitude is 4,000 feet. The pilot of the Singapore jet did not level off as required, causing a loss of required separation with Delta Air Lines Flight 2443, which was inbound to IAH at an altitude of 6,000 feet."
An air traffic controller noticed the issue and told pilots of both planes, according to the FAA statement.
The FAA says they've have taken steps to ensure all flight crews are aware of the top altitudes for standard departure routes.