Air traffic controller averts collision of two American Airlines jets sharing same call sign

Same call sign, opposite directions

American Airlines operates flights in both directions on the Chicago-to-Phoenix route under the same call sign, AA2482. On Thursday evening local time, a Boeing 737-800 departing Chicago for Phoenix left with a significant delay, while another Boeing 737-800 traveling from Phoenix to Chicago departed on schedule. The delay meant that both aircraft, carrying the identical call sign, ended up in the same airspace near Phoenix Sky Harbor International Airport around midnight on Friday. The airline uses the same call sign for both legs of the route, a practice that normally poses no issue when flights are staggered in time but created confusion once the delay placed both planes in proximity simultaneously. One aircraft was arriving from Chicago as the other was departing toward Phoenix, putting them on overlapping courses in the same airspace.

Close proximity

According to KOAA News 5, the two flights were separated by about three miles (roughly 4.8 kilometers) horizontally and about 2,000 feet (nearly 610 meters) vertically. American Airlines had formally complied with legal separation rules at those distances. However, the identical call sign created a risk that pilots could misinterpret which aircraft the controller was addressing. If both crews had assumed the controller's altitude instructions were directed at them, the overlapping flight paths could have led to a collision. The controller needed to ensure that each crew understood which commands applied to them, since both flights shared the same call sign and were operating in the same airspace at the same time.

Controller's intervention

The air traffic controller, who said he has worked in air traffic control for 25 years, distinguished the two flights by addressing one as "arriving 2482" and the other as "departing 2482." Audio published by the portal ATC.com captured the controller using those labels to avoid confusion. By using descriptive labels instead of the bare call sign, the controller prevented any ambiguity in radio communications. He ensured the two aircraft remained at different altitudes as their paths overlapped, eliminating the risk of collision. The controller recognized the problem when he noticed two flights with the same number and quickly found a way to tell them apart, keeping both at separate altitudes throughout the encounter.

“I've worked in air traffic control for 25 years. I've never experienced two planes with the same call sign being so close to each other. That is truly incredible.”

Aftermath

The controller later reflected on the severity of the situation in comments reported by ABC 15 and KOAA News 5.

“It could have been catastrophic, but I'm glad it worked out.”

Both aircraft continued safely without any collision. The incident stems from American Airlines assigning identical call signs to flights on the same route in opposite directions, a situation compounded when a delay placed both in the same airspace at once. The controller maneuvered the two Boeing 737-800s safely past each other.