Have you heard them on an airplane? 5 phrases and warning signs pilots and flight attendants use to communicate emergencies, according to Travel + Leisure

Passengers often hear strange phrases or sounds during flights, unaware of their true meaning. According to Travel + Leisure, pilots and flight attendants use specific codes and signals to communicate emergencies discreetly. These terms are designed to avoid causing panic among passengers while allowing crew members to handle critical situations efficiently. The five key expressions highlighted include “Código 300” or “Ángel,” which can indicate a serious medical emergency or the death of a passenger, depending on the airline’s procedures. “Código amarillo” refers to less severe medical incidents, while “Pan-pan” identifies a serious situation, though not necessarily life-threatening. The term “Sirena” is used to describe passengers who occupy empty seats to claim entire rows. Additionally, pilots may use acoustic signals or sequences of knocks to convey messages to the cabin crew. Jason Martinelli, director of operations at Cirrus Aviation Services, explained that these coded expressions can relate to passengers who are incapacitated, unconscious, or in critical condition. He emphasized that while some terminology is widely recognized, there is no universal standard across all airlines. Each carrier typically has its own internal codes and operational protocols, making communication more nuanced and context-dependent. Martinelli further noted that the purpose of using such language is to prevent unnecessary fear and confusion among passengers. Direct announcements over the public address system could lead to panic, anxiety, or even physical crowding in the aisles. Instead, brief, coded messages allow the crew to coordinate effectively without disrupting the overall atmosphere of the flight. David Cox, director of the Aviation Acron Academy, expressed unfamiliarity with the specific codes pilots use to communicate with the cabin crew through the public address system. He pointed out that even after September 11, there were no universally accepted codes for this type of communication. Cox suggested that pilots might rely on acoustic signals or rhythmic tapping patterns known to the cabin staff to relay information without alarming passengers. These methods ensure that critical information is conveyed swiftly and discreetly, maintaining order and safety within the aircraft. While the exact meanings of certain terms may vary slightly between airlines, the underlying goal remains consistent: to manage emergencies with calmness and efficiency, ensuring the well-being of everyone onboard.