Question: PSA Flight 182 was the deadliest crash in US aviation history until the flight that left which Chicago airport a year later?
Context: This is a list of aviation-related events from 1985.  It remains one of the deadliest years in aviation history for aviation disasters, including the crash of Japan Airlines Flight 123, bombing of Air India Flight 182, crash of Arrow Air Flight 1285, crash of Aeroflot Flight 7425, crash of Iberia Airlines Flight 610, Delta Air Lines Flight 191, Galaxy Airlines Flight 203, and British Airtours Flight 28M, a mid-air collision between Aeroflot Flight 8381 and a Soviet Air Forces transport aircraft, the hijacking of Egyptair Flight 648, and various crashes and other incidents with under 50 fatalities.  August 1985 remains the worst single month for commercial aviation fatalities in history. Aeroflot Flight 498 was a Soviet domestic passenger flight from Severomuysk to Ulan-Ude that crashed near Lake Baikal on 14 June 1981 en route to its planned stop at Nizhneangarsk Airport, Nizhneangarsk.  All 44 passengers — including 13 children — and 4 crew members on board were killed, and the aircraft was destroyed.  It remains the deadliest crash involving an Ilyushin Il-14.  At the time, it was the 30th-worst accident in Russian aviation history and is now the 50th-worst Russian aviation accident. Lionair Flight 602 was a Lionair Antonov An-24RV which fell into the sea off the north-western coast of Sri Lanka on 29 September 1998.  The aircraft departed Kankesanturai Airport with several high-ranking military officials of the Sri Lankan Army on a flight to Colombo and disappeared from radar screens just after the pilot had reported depressurization.  Initial reports indicated that the plane had been shot down by Liberation Tigers of Tamil Eelam terrorists using MANPADS.  All 7 crew and 48 passengers were killed.  Following the downing of Flight LN 602 all civil aviation between Colombo and Jaffna was suspended for many months by the Civil Aviation Authority.  At the time of the crash, it was the 3rd deadliest crash involving an Antonov An-24, currently the 4th. Loftleiðir HF LL 001, a charter flight, crashed on November 15, 1978 on approach just short of the runway at the international airport of Colombo, Sri Lanka.  The Douglas DC-8 crash killed 8 of the 13 Icelandic crew members, 5 reserve crew members and 170 (mostly Indonesian) Muslim pilgrims from South Borneo, out of a total of 262 passengers and crew.  The official report by Sri Lankan authorities gave the probable cause of the crash as being failure of the crew to conform to approach procedures; however U.S. and Icelandic authorities officially claim faulty equipment at the airport and air traffic control error as the cause of the crash.  It is by far the worst crash in Icelandic aviation history and the second worst in Sri Lankan aviation history after Martinair Flight 138 that crashed four years before. Air India 182 is a 2008 documentary directed by Sturla Gunnarsson, and produced by David York.  It is about the Air India Flight 182 bombing in 1985.  The Canadian Broadcasting Corporation commissioned the film, which originally had the preliminary title "Flight 182".  Gunarsson stated that he hoped the film would cause Canadians to contemplate domestic terrorism. American Airlines Flight 191 was a regularly scheduled passenger flight operated by American Airlines from O'Hare International Airport in Chicago to Los Angeles International Airport.  A McDonnell Douglas DC-10-10 used for this flight on May 25, 1979, crashed moments after takeoff from Chicago.  All 258 passengers and 13 crew on board were killed, along with two people on the ground.  It is the deadliest aviation accident to have occurred in the United States. Turkish Airlines Flight 981 was a regularly scheduled flight from Istanbul Yesilköy Airport to London Heathrow Airport with an intermediate stop in Paris at Orly Airport.  On 3 March 1974, the McDonnell Douglas DC-10 operating the flight crashed into the Ermenonville Forest, outside Paris, killing all 346 people on board.  At the time, it was the deadliest plane crash in aviation history.  It still remains the fourth-deadliest plane crash in aviation history, is the deadliest involving a DC-10, the second deadliest with no survivors, the deadliest single-plane crash with no survivors, the deadliest to have occurred on French soil, and the second worst aviation accident in Europe.  The crash was also known as the Ermenonville air disaster, from the forest where the aircraft crashed. Pacific Southwest Airlines (PSA) Flight 182 was a Boeing 727-214 commercial airliner, registration, N533PS that collided with a private Cessna 172 light aircraft, registration, N7711G over San Diego, California, at 9:01 am on Monday, September 25, 1978.  It was Pacific Southwest Airlines' first accident involving fatalities.  The death toll of 144 made it the deadliest aircraft disaster in California history.  Until the crash of American Airlines Flight 191 eight months later, it was also the deadliest plane crash in U.S. aviation history. Air India Flight 182 was an Air India flight operating on the Toronto–Montreal–London–Delhi route.  On 23 June 1985, the Boeing 747-237B serving the flight (c/n 21473/330, registration VT-EFO , "Emperor Kanishka") was destroyed by a bomb at an altitude of 31000 ft .  It crashed into the Atlantic Ocean while in Irish airspace.  It was the first bombing of a 747 jumbo jet.  A total of 329 people were killed, including 268 Canadian citizens, 27 British citizens and 24 Indian citizens.  The incident was the largest mass murder in Canadian history, and the deadliest incident in the history of Air India.  It was the deadliest terrorist attack involving an airplane until the September 11, 2001, attacks.  The bombing of Air India 182 occurred at the same time as the Narita Airport bombing.  Investigators believe that the two plots were linked, and that those responsible were aiming for a double bombing.  However, the bomb at Narita exploded before it could be loaded onto the plane. Uzbekistan Airways Flight 1154 (HY1154/UZB1154) was a scheduled domestic passenger flight which was operated by Uzbekistan flag carrier Uzbekistan Airways from Termez Airport in the city of Termez, near the Afghanistan border, to Uzbekistan's capital of Tashkent.  On 13 January 2004 the aircraft operating the flight, a Yakovlev Yak-40 registered in Uzbekistan as UK-87985, collided with a radar station while landing at Tashkent, flipped over, caught fire and exploded, killing all 37 people on board.  Weather was reportedly in bad condition.  The crash was the third deadliest crash in Uzbekistan.
Answer: O'Hare International Airport