{"id":144075,"date":"2026-05-27T19:02:00","date_gmt":"2026-05-27T13:32:00","guid":{"rendered":"https:\/\/aviationa2z.com\/?p=144075"},"modified":"2026-05-27T18:59:45","modified_gmt":"2026-05-27T13:29:45","slug":"air-india-delhi-san-francisco-flight-with-777-makes-u-turn","status":"publish","type":"post","link":"https:\/\/aviationa2z.com\/index.php\/2026\/05\/27\/air-india-delhi-san-francisco-flight-with-777-makes-u-turn\/","title":{"rendered":"Air India Delhi to San Francisco Flight with Boeing 777 Makes U-Turn"},"content":{"rendered":"\n

GURUGRAM\u2013<\/strong> Tata Group-owned Air India (AI)<\/a> flight AI173 operating from Delhi (DEL) to San Francisco (SFO) returned to the Indian capital on Tuesday (May 27, 2026) after the crew identified a technical snag while approaching Chinese airspace. The Boeing 777 widebody was carrying 230 passengers at the time of the incident.<\/p>\n\n\n\n

The aircraft had been airborne for nearly three hours before the crew decided to turn back as a precautionary measure. The return leg from Indira Gandhi International Airport (DEL) to San Francisco International Airport (SFO) was suspended in line with standard operating procedures, and the airline has since arranged alternative travel options for affected passengers.<\/p>\n\n\n\n

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Photo: Siddh Dhuri\/ Mumbaiplanes, Go follow him on Instagram<\/figcaption><\/figure>\n\n\n\n

Air India San Francisco Flight U-Turn<\/h2>\n\n\n\n

According to sources, the cockpit crew detected the technical issue roughly three hours into the ultra-long-haul flight, just as the aircraft was approaching Chinese airspace.<\/p>\n\n\n\n

Following established protocols, the pilots elected to return to Delhi rather than continue toward San Francisco. The return journey added approximately three and a half hours of flying time.<\/p>\n\n\n\n

Before the aircraft could land, it remained airborne for nearly an additional hour to complete fuel jettison procedures. The total airborne duration came to almost eight hours.<\/p>\n\n\n\n

Airline sources explained that the fuel dump was required because a Boeing 777<\/a> departs on the Delhi\u2013San Francisco route at a very high take-off weight, carrying large fuel reserves needed for the ultra-long-haul sector.<\/p>\n\n\n\n

Landing with that much fuel onboard would exceed the maximum permissible landing weight of the aircraft.<\/p>\n\n\n\n

Air India Confirms Technical Inspection<\/h4>\n\n\n\n

In its official statement, the airline confirmed the diversion and the reason behind it. An Air India spokesperson said flight AI173 from Delhi to San Francisco<\/a> on 27 May returned to Delhi due to a technical issue in accordance with laid-down procedures.<\/p>\n\n\n\n

The aircraft landed safely and will undergo a technical inspection in line with Air India\u2019s safety standards.<\/p>\n\n\n\n

The spokesperson added that the safety and well-being of passengers and crew remain the airline\u2019s highest priority. The 777 will not return to service until engineering teams clear the aircraft after inspection.<\/p>\n\n\n\n

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Photo: Jan Damrath<\/figcaption><\/figure>\n\n\n\n

Alternative Arrangements for Stranded Passengers<\/h4>\n\n\n\n

Air India confirmed that ground teams at Delhi airport<\/a> are actively assisting passengers affected by the disruption.<\/p>\n\n\n\n

The airline is providing refreshments, hotel accommodation, and rescheduling options based on passenger preferences. Alternative travel arrangements are being put in place to ferry passengers to San Francisco at the earliest opportunity.<\/p>\n\n\n\n

The carrier expressed regret over the inconvenience caused and said efforts are underway to minimise further delays for the 230 travellers booked on the long-haul service.<\/p>\n\n\n\n

Fuel jettison, while uncommon, is a standard procedure for widebody aircraft operating ultra-long-haul routes. Flights such as Delhi to San Francisco require the aircraft to carry a heavy fuel load at departure, which exceeds the safe landing weight.<\/p>\n\n\n\n

When such an aircraft must return shortly after take-off, the crew releases fuel in a controlled manner at a safe altitude to bring the aircraft within landing weight limits.<\/p>\n\n\n\n

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Photo: File:Air India B777-300ER(VT-ALQ) (4444918365).jpg – Wikimedia Commons<\/figcaption><\/figure>\n\n\n\n

ACARS Analysis \u2014 AI173 \/ VT-ALL, 27 May 2026<\/h2>\n\n\n\n

This log captures a Boeing 777-300ER (VT-ALL) operating AI173 Delhi (VIDP) \u2192 San Francisco (KSFO) that turned back over Chinese airspace on company instructions. Air India later confirmed the return was due to a technical issue in accordance with laid-down procedures, with the aircraft ultimately spending over 8 hours airborne before landing back at Delhi. Deccan Chronicle<\/a><\/p>\n\n\n\n

Below is what the messages actually show, in chronological order.<\/p>\n\n\n\n

Reading the header<\/h4>\n\n\n\n

Each line shares the same metadata block: ICAO 24-bit address 8003E4<\/strong> (= VT-ALL), flight AI173<\/strong>, type B77W<\/strong> (777-300ER), routed via Inmarsat GES 50<\/strong> (POR \u2014 Pacific Ocean Region satellite) on link L-143E<\/code>. The shift from L-143E<\/code> (Inmarsat data link) to C-143E<\/code> around 02:04Z indicates a channel change, typical when an OOOI\/position class message goes up.<\/p>\n\n\n\n

Timeline of events (UTC)<\/h4>\n\n\n\n

00:31:44 \u2013 00:31:50 | End of Yangon FIR datalink<\/strong> Three near-simultaneous messages from RGNCAYA<\/strong> (Yangon ACC, Myanmar) terminate the FANS-1\/A session:<\/p>\n\n\n\n