SEATTLE- Atlanta-based Delta Air Lines (DL) flight from Seoul Incheon Airport (ICN) to Minneapolis–Saint Paul International Airport (MSP) made an emergency landing at Seattle–Tacoma International Airport (SEA) on July 6, 2025.
Flight DL170 diverted mid-journey following a critical medical emergency involving an elderly passenger. The aircraft landed safely at SEA, and medical personnel promptly attended to the passenger upon arrival.

Delta Flight Emergency Landing at SEA
The emergency began over the Pacific Ocean between Alaska and Washington, around three hours from Seattle.
According to passengers, the elderly man, estimated to be in his 70s, became unresponsive and showed signs of low oxygen saturation (hypoxia). Flight attendants issued an onboard call for medical professionals, prompting a doctor and nurse to assist.
The passenger was reportedly slouched and could only respond minimally. He had complained of chest pain earlier in the day. Onboard responders administered oxygen and coordinated with Delta’s ground medical team.
Despite signs of slight improvement, the decision was made to divert to Seattle to ensure timely medical attention.
Upon landing at Seattle–Tacoma International Airport (SEA), emergency medical technicians (EMTs) were ready at the gate. The passenger was swiftly taken off the aircraft for further treatment. Delta’s response and coordination with ground services ensured the passenger received urgent care with minimal delay.
The aircraft remained grounded for approximately two additional hours due to flight crew duty limitations. Eventually, the airline permitted passengers to disembark while alternate arrangements were made.

Passenger Rebooking Challenges After Diversion
Several passengers, including those with connecting flights at MSP, faced delays and logistical difficulties. Rebooking processes at SEA were hampered by system limitations, with the Delta app not recognizing Seattle as the new destination for hours.
Many travelers relied on in-terminal agents, who struggled with manual rebooking protocols that involved extended phone verification.
Some passengers successfully rebooked later direct flights to their final destinations, while others waited for the aircraft to resume its journey with a new flight crew. Travelers reported frustration with the lack of streamlined workflows for handling diversion-related rebookings.
Though the emergency landing showcased effective coordination between in-flight staff, medical professionals, and airport responders, the post-diversion handling revealed areas for operational improvement.
Inconsistent app updates, complex rebooking processes, and high dependency on manual interventions highlighted the need for enhanced contingency systems in such scenarios.
Despite the disruption, passengers acknowledged the professionalism of the Delta Air Lines crew and medical responders, who acted swiftly to manage the health crisis midair.

Technical ACARS Message
Looking at this ACARS message:
Message Header:
- Aircraft: A359 (Airbus A350-900)
- Registration: N508DN (Delta Air Lines)
- Flight: DL170
- ICAO Code: A65800
- Source: L-98W (likely ground station)
- Time: 2025-07-06 18:16:01 UTC
Message Content: This appears to be a diversion message with two parts:
Part 1 – Initial Diversion Notice:
- AES (Aircraft Earth Station) message indicating a diversion uplink
- Government regulations apply to all diversions
- Flight timing details (starts when flight is ON, ends when OFF the ground)
- Captain’s instructions for passenger handling during diversion
Part 2 – Amended Flight Plan:
- Medical emergency diversion to KSEA (Seattle-Tacoma International Airport)
- The original destination was likely an international airport
- Aircraft given direct routing with emergency handling
- Weight information: approximately 3000 lbs over maximum structural landing weight
- Requires fuel dumping and inspection upon landing
- Replan from 5000N13959 (likely a waypoint over the Pacific)
Flight Details:
- Altitude: None specified, clearance index 12
- Fuel/Time/Burn data provided
- 10% fuel reserves
- RVSM (Reduced Vertical Separation Minimum) clearance at FL330/6553
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