Waymo said the incident led Mike Johns to be delayed by just over five minutes on the way to Phoenix Sky Harbor, but Johns said he missed his flight.

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

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) has disclosed that Delta Air Lines and United Airlines aircraft were involved in a near-miss in Phoenix, Arizona, on January 11 of this year. The FAA issued a short statement detailing that Delta Air Lines and United Airlines aircraft both landed safely after a loss of required separation when the planes were inbound to Phoenix Sky Harbor International Airport(PHX) on January 11.

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