The Federal Aviation Administration is investigating a close call between a JetBlue aircraft and a small plane near Fort Lauderdale-Hollywood International Airport in Florida.

According to the FAA, the JetBlue plane received an onboard alert warning about another nearby aircraft that was "not in communications with air traffic control." The alert system is designed to warn pilots when another aircraft poses a potential collision risk.

During the incident, air traffic controllers made comments about the pilot of the small aircraft, with one controller calling the pilot "insane" and referring to them as "Mad Max," according to audio recordings.

The FAA has not released additional details about the specific circumstances of the encounter, including the exact distance between the aircraft or whether any evasive maneuvers were taken. The agency routinely investigates incidents involving aircraft proximity alerts to determine if safety protocols were followed.

Neither JetBlue nor representatives for the small aircraft operator have publicly commented on the incident. The investigation remains ongoing as federal officials review flight data and communications records from the encounter.