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

Both aircraft were inbound to the airport when a loss of separation occurred during their approach for landing

The close call between the United and Delta flights at the Phoenix airport comes amid an increase in plane near-collisions.

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

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

At the same time, a similar alert was set off on a United Flight 1724 from San Francisco, carrying 123 ... according to FlightRadar24. The FAA noted both planes landed safely "after experiencing ...

Delta Air Lines and United flights come close when both attempt to land at Phoenix Sky Harbor International Airport

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

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.