FAA officials say the two planes "landed safely after experiencing a loss of required separation" as they were headed to Sky Harbor.

The Federal Aviation Administration is investigating after a United Airlines flight and a Delta Airlines flight had a near-collision over Phoenix on Saturday.

The FAA has launched an investigation into a loss of separation between two commercial flights in Phoenix Saturday.

The two flights, United Airlines Flight 1724 and Delta Air Lines Flight 1070 came too close to each other while arriving at the airport.

The United and Delta flights were less than a quarter of a mile apart horizontally before the warning devices went off, officials say.

A United flight from San Francisco and a Delta flight from Detroit came within 425 feet of each other in the sky, according to flight radar data. NTSB guidelines say planes should always stay at least five miles apart.

The FAA is investigating a narrowly missed midair collision between a United flight and a Delta flight at Phoenix Sky Harbor International Airport on Saturday, the agency said.

A Delta Air Lines plane and a United Airlines aircraft raised alarms when they flew too close to each other while flying into Phoenix on Saturday. The Federal Aviation Administration is investigating the “loss of required separation” incident.

We are just a few steps from the finish line. We want to turn what are now one- and two-hour trips into five-minute trips.”

Authorities in Monterey County, California lifted all evacuations Friday night, one day after a fire broke out at one of the world's largest lithium battery storage facilities.

The incident in which a SpaceX rocket broke up after launch demonstrates the challenges the FAA will face as the number of commercial space flights increases.