The planes, carrying more than 350 people, experienced "a loss of required separation" while preparing to land at the same Phoenix airport, the FAA said.

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.

The FAA said it is investigating after a Delta Air Lines flight and United Airlines flight experienced 'a loss of required separation' while heading inbound to Phoenix Sky Harbor International Airport.

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

CNN has reached out to Phoenix Sky Harbor International Airport, Delta Air Lines and United Airlines for comment. The incident in Phoenix follows a rise in recent years of "runway incursions ...

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

The Federal Aviation Administration 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.

The pilots talked to air traffic controllers who appear to have directed the planes to "resequence," and flight data appears to show both making a circle before landing safely.

A United Airlines 737 MAX 9 jet hit a coyote during takeoff on Sunday. It wasn't the only flight incident involving United over the weekend.