WestJet Emergency London Flight – WS2 Medical Alert Over Ireland

A WestJet Boeing 787-9 Dreamliner bound for London Heathrow declared a general emergency on December 22, 2025, after a passenger experienced a medical crisis while cruising at 39,000 feet over Northern Ireland. The aircraft, operating flight WS2 from Calgary, continued to its destination without diverting, landing safely at Heathrow Terminal 4 with emergency services standing by on the tarmac.

The incident occurred during the transatlantic leg of the approximately nine-hour journey from western Canada to London. Air traffic controllers monitored the situation closely as the crew managed the medical emergency while maintaining standard communication protocols throughout the descent and approach.

Emergency medical teams were positioned at the airport to receive the aircraft upon landing, ensuring the affected passenger received immediate care. The flight touched down on runway 09R at Heathrow, completing what began as a routine long-haul service that prompted an urgent airborne response.

WestJet UK Emergency Overview

Key Facts From the Incident

• The aircraft involved was a 6.8-year-old Boeing 787-9 Dreamliner bearing the registration C-GUDO, delivered to WestJet in March 2019.
• The emergency code 7700 was transmitted while flying over the Belfast area at flight level 390 (39,000 feet).
• Crew members assessed and managed the medical situation onboard before the aircraft initiated its descent toward London.
• The decision was made to continue to London Heathrow rather than divert to closer airfields such as Dublin or Manchester.
• Medical teams had been arranged to wait at the destination, making continuation the safer operational choice.
• The transponder code was changed to 7647 minutes after the initial emergency declaration, indicating the situation had been brought under control.
• The aircraft received priority routing for a direct approach to runway 09R at Heathrow Terminal 4.

Snapshot of the Emergency

The Decision Not to Divert

Why the Crew Continued to London

Airline crews receive specific training for managing in-flight medical emergencies, which includes assessing the severity of a passenger’s condition and determining the most appropriate course of action. In this case, the flight crew evaluated the situation and concluded that diverting to a nearer airport was neither necessary nor more beneficial than continuing to the original destination.

The decision to maintain the planned route to London Heathrow was influenced by several operational factors. Emergency medical services had been pre-positioned at the arrival airport, and diverting would have required landing at an unfamiliar airfield where reception arrangements would need to be established from scratch.

Airports such as Dublin and Manchester lie closer to the aircraft’s position over Northern Ireland, yet the crew determined that the established support infrastructure at Heathrow offered a clearer advantage. This reflects standard aviation protocol where crew judgment, combined with real-time coordination with ground operations, shapes the final decision.

How Emergency Codes Work

When a pilot activates transponder code 7700, it signals a general emergency to air traffic control facilities across the region. This designation grants the aircraft priority handling, allowing controllers to clear airspace and prepare for an expedited landing if required.

The subsequent change to code 7647 indicates that the emergency has been resolved or downgraded, though the aircraft remains a priority flight. This code system, maintained by IATA and aviation authorities worldwide, provides a rapid communication method between cockpit and ground without requiring voice transmission.

Medical Emergencies at Altitude

The Challenge of In-Flight Medical Care

Flying at 39,000 feet presents unique challenges when a passenger falls ill. Cabin pressure equivalent to 8,000 feet altitude means that underlying conditions can be exacerbated, and medical equipment accessibility becomes a critical factor. WestJet equips its Dreamliner fleet with standard emergency medical kits, and crews undergo initial training to handle common medical scenarios.

The Aviation Safety Network tracks incidents where passenger health necessitates cabin intervention. While most medical emergencies result in successful outcomes, each case requires careful assessment to determine whether diversion or continued flight serves the passenger best.

Passenger Care Upon Landing

Upon touching down at Heathrow Terminal 4, the Dreamliner was met by waiting paramedics who transferred the affected passenger for further evaluation. London Heathrow maintains dedicated procedures for medical emergencies involving arriving aircraft, ensuring minimal delay while providing immediate care.

No additional disruptions to other flights were reported as a result of the priority handling required for the Dreamliner. Air traffic control coordination ensured the aircraft was guided directly to its stand without impacting the broader airport operations.

Chronology of the Emergency

1. 21 December 2025, 21:23 MST: WestJet Flight WS2 departs Calgary International Airport bound for London Heathrow.
2. 22 December 2025, 11:37 GMT: The Boeing 787-9 Dreamliner declares emergency code 7700 while cruising at FL390 over Northern Ireland near Belfast.
3. 11:41 GMT: Air traffic control confirms the aircraft will continue its planned route to London Heathrow rather than divert.
4. 11:42 GMT: Aircraft identification C-GUDO is confirmed via flight tracking records.
5. 11:45 GMT: Social media updates confirm a medical emergency involving a passenger onboard.
6. 11:48 GMT: Transponder code changes to 7647, indicating the emergency has been resolved.
7. 11:56 GMT: The aircraft begins descent near Chester, entering the final approach sequence to Heathrow.
8. 12:27–12:34 GMT: Safe landing at London Heathrow Terminal 4, runway 09R. Emergency services receive the passenger.

What We Know and What Remains Unclear

WestJet Operations and UK Connectivity

WestJet has expanded its international footprint over recent years, with London Heathrow serving as a key gateway for passengers traveling between North America and Europe. The airline’s transatlantic services connect major Canadian cities with the United Kingdom, offering competitive alternatives to legacy carriers on routes across the Atlantic.

The incident Flight WS2 represents one of the longer routes in the WestJet network, requiring dedicated long-haul aircraft such as the Boeing 787 Dreamliner. These aircraft are equipped to handle extended flight durations and feature cabin configurations suited for passenger comfort over multi-hour journeys.

According to publicly available advisories on the WestJet website, the airline’s communications as of early 2026 have focused on operational notices unrelated to the December 2025 emergency, including guidance on U.S. TSA staffing and Canadian border processing procedures. No formal statement specifically addressing the WS2 incident has been published in sources accessible at the time of this reporting.

Sources and Coverage

The WestJet Dreamliner inbound to London was declaring an emergency over Northern Ireland. The aircraft is currently being handled by air traffic control and is continuing towards its destination.

— Airlive.net incident report, 22 December 2025

Crew and air traffic control coordination ensured efficient handling of the situation throughout the descent and landing at Heathrow.

— Travel and Tour World coverage

The information compiled in this article draws from aviation news outlets Airlive.net, The Aviation Hub, and Travel and Tour World. These sources provided independent confirmation of flight tracking data, timeline events, and the operational circumstances surrounding the emergency declaration.

Summary

WestJet Flight WS2 successfully managed a passenger medical emergency at cruising altitude over Northern Ireland on December 22, 2025, completing its journey to London Heathrow without diverting. The Boeing 787-9 Dreamliner landed safely at Terminal 4 with emergency services in attendance, and the affected passenger received prompt care upon arrival. While official details regarding the passenger’s condition remain limited, the incident demonstrates the effectiveness of coordinated emergency protocols between flight crews, air traffic controllers, and ground-based medical teams. Those monitoring the situation can access the latest updates on related London events through our coverage platform.

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