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

Multiple airlines are being affected by the delays including DELTA, American Airlines, Southwest, and a few others.

Here's when you can eat and drink at Garrett Popcorn, Guy Fieri's Phoenix Kitchen + Bar and other new options opening in Terminal 4 soon.

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.

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

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