The Federal Aviation Administration is once again looking into a close call at a major U.S. airport, after two passenger jets narrowly avoided a mid-air collision as they attempted to land in Phoenix.

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 Federal Aviation Administration (FAA) said it is investigating a recent near-midair collision of flights that were approaching Phoenix Sky Harbor International Airport. A Delta Air Lines

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 Federal Aviation Administration (FAA) is investigating after a United ... had a near-collision while preparing to land in Phoenix over the weekend. United Airlines Flight 1724 and Delta ...

The planes experienced “a loss of required separation” when they were heading toward Phoenix Sky Harbor International ... Giddens told ABC News. The FAA said it is investigating the incident.

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 FAA has begun an investigation into a midair incident involving a United Airlines Boeing 737-900ER and a Delta Air Lines Airbus A330-300.

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

A plane hit a coyote during takeoff at Chicago O'Hare Airport on Sunday and diverted back to the airport after declaring an emergency, officials said.