What is a code red on a flight?

A code red on a flight is a crew-level emergency designation signaling an onboard situation requiring immediate response. It most commonly indicates a passenger medical emergency, such as cardiac arrest, stroke, or severe respiratory distress. The term can also apply to fire on board, serious mechanical issues, or a security threat requiring escalated action from the flight crew.

Does a code red always mean the plane will divert?

No. Most code red situations are resolved on board without diversion. A 2025 study of more than 77,000 in-flight medical events found that only 1.7% resulted in aircraft diversion. The captain makes the diversion decision in consultation with ground medical support, weighing the passenger's condition against flight time to the nearest airport and available emergency resources.

How is a code red different from official aviation emergency codes?

A code red is an internal crew alert, not a standardized IATA or FAA protocol. Pilots communicate emergencies to air traffic control using transponder squawk codes: 7700 for a general emergency, 7600 for communications failure, and 7500 for hijacking. These codes are universal and ATC-recognized. A code red is used inside the aircraft to coordinate the crew's on-board response.

What should a passenger do during a code red?

Stay seated, keep the aisle clear, and follow cabin crew instructions. If you have medical training as a physician, nurse, or paramedic, respond when the crew pages for a volunteer. After landing, contact your travel manager to start rebooking. If your company uses Navan, your travel manager may already have a notification about the disruption and be arranging alternatives.

Who is responsible for a business traveler's well-being after a code red diversion?

Both the airline and the employer carry responsibility. Airlines are legally required to assist passengers during emergencies and diversions. Employers have a duty of care obligation during work-related travel, covering rebooking, ground transportation, and communication when a flight diverts. Navan's travel platform monitors active itineraries and alerts travel managers when a traveler's flight is diverted, so companies can respond immediately.

Can travel insurance cover costs from a flight diversion caused by a code red?

Coverage varies by policy. Business travel insurance often covers additional accommodation and rebooking costs from unplanned diversions, but the specific terms depend on your carrier and plan. Review your corporate travel policy and insurance terms before any trip to understand which expenses are reimbursable when disruptions occur outside the traveler's control.

Navan - Business Travel Solutions & Expense Management

Code Red Flight

A code red flight is an emergency designation used by airline cabin crew to signal an onboard crisis requiring immediate response, most often triggered by a passenger medical emergency.

Victoria Landsmann

•June 11, 2026•

5 minute read

Key Takeaways

A code red flight is an aviation emergency designation used by cabin crew to signal an onboard crisis requiring immediate response. Most often, it indicates a passenger medical emergency serious enough to trigger the airline's full emergency protocol, potentially including diverting the aircraft to the nearest suitable airport.

In-flight medical emergencies occur in roughly 1 in 212 commercial flights, with about 1.7% resulting in aircraft diversion, per a 2025 study published in JAMA Network Open.[1]
"Code Red" is a crew-level internal alert, not a standardized IATA or FAA protocol. Official ATC transponder emergency codes are separate: 7700 (general emergency), 7600 (communications failure), and 7500 (hijacking).
Cabin crew follow a structured response when a code red is declared: assess the passenger, page for onboard medical volunteers, notify the flight deck, and connect with a ground physician for real-time guidance.
Navan notifies travel managers when an employee's flight is diverted or significantly disrupted, supporting the duty of care responsibilities that employers carry during business travel.

What is a code red flight?

A code red flight is an emergency designation used by airline cabin crew to signal a situation requiring immediate priority response. The term most commonly applies when a passenger has a medical emergency: cardiac arrest, suspected stroke, severe respiratory distress, or a serious allergic reaction. It can also refer to other critical situations, including fire on board, serious mechanical failures, or a security threat that demands an escalated response from the crew and operations center.

"Code red" is not a standardized IATA or FAA protocol. It's an internal crew-level alert used by airlines as part of their own emergency communication frameworks. Official emergency communication between pilots and air traffic control uses transponder squawk codes: 7700 for a general emergency, 7600 for radio communications failure, and 7500 for hijacking or unlawful interference. These squawk codes are universal and ATC-recognized; a code red operates inside the aircraft to coordinate the crew, not outside on the transponder.

The term draws from the color-coded alert system used across emergency services and healthcare industries, where red signals the highest level of severity requiring immediate intervention. Different carriers may use different internal designations, but the underlying concept is consistent across the industry: a flight in a state of emergency requiring immediate, coordinated action from everyone involved.

How cabin crew respond to a code red

When cabin crew declare a code red, the response follows a structured sequence designed to stabilize the situation on board while the flight deck assesses whether diversion is necessary.

The crew member nearest the affected passenger performs a rapid assessment: is the person conscious, breathing, and able to respond? The crew applies first aid and deploys onboard equipment. Commercial aircraft operating under FAA and Transport Canada regulations carry required medical kits, oxygen equipment, and automated external defibrillators (AEDs) as standard equipment.

An announcement goes out to the cabin requesting any onboard medical professionals. Physicians, nurses, and paramedics travel as passengers frequently enough that most carriers train crew specifically to recognize and work with volunteers. A 2025 study of more than 77,000 in-flight medical events published in JAMA Network Open found that physician volunteers participated in nearly one-third of cases. Though their involvement correlated with a higher likelihood of diversion since they tended to be called for the most serious situations.[1]

The flight deck is then notified. Most major carriers contract with a ground-based medical advisory service that connects the crew in real time with emergency physicians. These physicians guide treatment and help the captain make a clinically informed decision about whether to continue to the destination, divert to the nearest suitable airport, or request a priority landing at a major hub with full emergency services on standby.

When a code red results in flight diversion

Aircraft diversion is the most significant operational outcome of a code red situation. The captain makes the diversion decision in consultation with ground medical support, weighing the passenger's clinical status, flight time to the nearest suitable airport, available emergency services on the ground, and the condition of the aircraft.

According to the 2025 JAMA Network Open study of 77,790 in-flight medical events across 84 airlines, diversion occurred in 1.7% of events. Neurologic conditions, including suspected stroke and seizures, accounted for 41% of diversions; cardiovascular conditions accounted for 27%.[1] That diversion rate translates to roughly 1 in every 8,100 commercial flights ending at an unplanned airport due to a medical emergency.

For passengers on a diverted flight, the practical impact extends well beyond the immediate emergency. Travelers with a connecting flight typically miss their connection. Baggage may end up at the original destination. Ground transportation needs to be arranged from an unplanned city. When this disruption happens on a business trip, it can push back client meetings, collapse tight schedules, and generate unexpected expenses that need to be tracked and reimbursed.

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What code red means for business travelers

Understanding code red protocols prepares business travelers to respond calmly rather than adding to the stress of an already difficult situation. If cabin crew call for medical volunteers, anyone with clinical training as a physician, nurse, or paramedic should respond. For everyone else, staying seated, keeping the aisle clear, and following crew instructions is the most constructive course of action.

For travel managers and HR teams, a code red event involving an employee raises duty of care questions. Duty of care is the employer's legal and moral obligation to protect employees from foreseeable harm during work-related travel, and a flight diversion falls squarely within that obligation. Employees who land at an unplanned airport may need rebooking, ground transportation, accommodation, and clear communication channels with their team and emergency contacts.

GBTA's 2025 research on travel manager priorities found that 54% of corporate travel managers list proactive disruption management as a top desired innovation in travel management services, ahead of risk management and NDC servicing capabilities.[2] Real-time flight monitoring and automated alerts are increasingly central to how travel programs fulfill their duty of care commitments. Navan provides travel managers with visibility into active employee itineraries and sends notifications when a traveler's flight status changes significantly, so teams can act before travelers need to ask for help.

Duty of care: The employer's legal and moral obligation to protect employees from foreseeable harm during work travel, including providing support when a flight diverts due to a code red emergency.
Cabin crew: The flight attendants responsible for passenger safety onboard, including initiating and coordinating the code red response sequence when a crisis occurs.
Connecting flight: A flight segment that continues to another route. Code red diversions frequently create cascading disruptions for travelers with onward connections at the originally intended destination.
Travel advisory: A risk designation issued by government agencies for specific destinations. Business travelers and travel managers consult advisories alongside in-flight emergency protocols when assessing overall trip risk.
Business travel: The practice of traveling for work purposes. Understanding in-flight emergency protocols is part of preparing employees for the realities of frequent business travel.

Sources

[1] Alves PM et al., "In-Flight Medical Events on Commercial Airline Flights," JAMA Network Open, 2025

[2] GBTA in partnership with Direct Travel, Spotnana, and Troop, "The Perfect Business Trip," Global Business Travel Association research, 2025, via Hospitality Net

Frequently Asked Questions About Code Red Flights

A code red on a flight is a crew-level emergency designation signaling an onboard situation requiring immediate response. It most commonly indicates a passenger medical emergency, such as cardiac arrest, stroke, or severe respiratory distress. The term can also apply to fire on board, serious mechanical issues, or a security threat requiring escalated action from the flight crew.
No. Most code red situations are resolved on board without diversion. A 2025 study of more than 77,000 in-flight medical events found that only 1.7% resulted in aircraft diversion. The captain makes the diversion decision in consultation with ground medical support, weighing the passenger's condition against flight time to the nearest airport and available emergency resources.
A code red is an internal crew alert, not a standardized IATA or FAA protocol. Pilots communicate emergencies to air traffic control using transponder squawk codes: 7700 for a general emergency, 7600 for communications failure, and 7500 for hijacking. These codes are universal and ATC-recognized. A code red is used inside the aircraft to coordinate the crew's on-board response.
Stay seated, keep the aisle clear, and follow cabin crew instructions. If you have medical training as a physician, nurse, or paramedic, respond when the crew pages for a volunteer. After landing, contact your travel manager to start rebooking. If your company uses Navan, your travel manager may already have a notification about the disruption and be arranging alternatives.
Both the airline and the employer carry responsibility. Airlines are legally required to assist passengers during emergencies and diversions. Employers have a duty of care obligation during work-related travel, covering rebooking, ground transportation, and communication when a flight diverts. Navan's travel platform monitors active itineraries and alerts travel managers when a traveler's flight is diverted, so companies can respond immediately.
Coverage varies by policy. Business travel insurance often covers additional accommodation and rebooking costs from unplanned diversions, but the specific terms depend on your carrier and plan. Review your corporate travel policy and insurance terms before any trip to understand which expenses are reimbursable when disruptions occur outside the traveler's control.