Question: When was Umar Farouk Abdulmutallab attempting to detonate plastic explosives on Northwest Airlines Flight 253?

full_context: Document 1: Umaru Mutallab: Alhaji Umaru Abdul Mutallab (born 15 December 1939) is a Nigerian business and banking leader, and former minister of Economic Development under the military government of Murtala Mohammed. He played a major role in introducing Islamic banking into Nigeria. Mutallab was described by "The New York Times" as "among Nigeria's richest and most prominent men," by "The Telegraph" as being "one of Nigeria's most prominent bankers", and by "The Guardian" as being "one of the country's most respected businessmen". Mutallab's son, Umar Farouk Abdulmutallab, is a student who attempted to detonate plastic explosives aboard Northwest Airlines Flight 253 on 25 December 2009.
Document 2: United Airlines Flight 232: United Airlines Flight 232 was a DC-10, registered as N1819U, that crash-landed at Sioux City, Iowa in July 19, 1989 after suffering catastrophic failure of its tail-mounted engine, which led to the loss of all flight controls. The flight was en route from Stapleton International Airport in Denver, Colorado to O'Hare International Airport in Chicago. Of the 296 passengers and crew on board, 111 died in the accident and 185 survived in total. Despite the deaths, the accident is considered a prime example of successful crew resource management due to the large number of survivors and the manner in which the flight crew handled the emergency and landed the airplane without conventional control.
Document 3: Pan Am Flight 103: Pan Am Flight 103 was a regularly scheduled Pan Am transatlantic flight from Frankfurt to Detroit via London and New York. On 21 December 1988, N739PA, the aircraft operating the transatlantic leg of the route, was destroyed by a bomb, killing all 243 passengers and 16 crew, in what became known as the Lockerbie bombing. Large sections of the aircraft crashed onto residential areas of Lockerbie, Scotland, killing 11 more people on the ground.
Document 4: Northwest Airlines Flight 253: Northwest Airlines Flight 253 was an international passenger flight from Amsterdam Airport Schiphol in Haarlemmermeer, Netherlands, to Detroit Metropolitan Wayne County Airport in Romulus, Michigan, United States. The flight was the target of a failed al-Qaeda bombing attempt on Christmas Day, December 25, 2009, in which a passenger tried to set off plastic explosives sewn to his underwear. There were 290 people on board the aircraft—an Airbus A330-323E operated by Northwest Airlines, which had merged with Delta Air Lines the year before. Had the attempt succeeded, it would have surpassed American Airlines Flight 191 as the deadliest aviation occurrence on U.S. soil and tied Iran Air Flight 655 as the eighth-deadliest of all time. The incident was also the second in 2009 involving an Airbus A330, after the crash of Air France Flight 447 on June 1. This was also the final accident/incident involving Northwest Airlines as it closed down a month later when it merged with Delta Air Lines.
Document 5: Reactions to the Northwest Airlines Flight 253 attack: Reactions to the Northwest Airlines Flight 253 attack
Document 6: Southwest Airlines Flight 345: Southwest Airlines Flight 345 was a scheduled flight from Nashville International Airport to New York City's LaGuardia Airport on July 22, 2013. The Boeing 737 suffered a collapse of its front landing gear while landing at LaGuardia Airport, injuring 9 people on board. The aircraft, which was worth an estimated $15.5 million at the time, was written off as a total loss and scrapped as a result of the accident.
Document 7: Aftermath of the Northwest Airlines Flight 253 attack: Aftermath of the Northwest Airlines Flight 253 attack
Document 8: Dana Air Flight 992: Dana Air Flight 992 was a scheduled domestic commercial passenger flight from Abuja to Lagos, Nigeria. On Sunday, 3 June 2012, the McDonnell Douglas MD-83 aircraft operating the flight crashed into a furniture works and printing press building in the Iju-Ishaga neighbourhood of Lagos. The crash resulted in the deaths of all 153 people on board and 10 more on the ground. The crash of Flight 992 is the deadliest aviation disaster involving a McDonnell Douglas MD-83, as well as the second-deadliest involving an MD-80 series aircraft, behind Inex-Adria Aviopromet Flight 1308. It is also the second-deadliest aircraft crash on Nigerian soil, behind the Kano air disaster of 1973.
Document 9: Delta Air Lines–Northwest Airlines merger: On April 15, 2008, Delta Air Lines and Northwest Airlines announced a merger agreement. The merger of the two carriers formed what was then the largest commercial airline in the world, with 786 aircraft. The merged airline is called "Delta Air Lines."
Document 10: EgyptAir Flight 990: EgyptAir Flight 990 (MS990/MSR990) was a regularly scheduled flight from Los Angeles International Airport, United States, to Cairo International Airport, Egypt, with a stop at John F. Kennedy International Airport, New York City. On October 31, 1999, the Boeing 767 operating the route crashed into the Atlantic Ocean about 60 mi south of Nantucket Island, Massachusetts, killing all 217 people on board. The official probable cause of the crash was deliberate action by the relief first officer.
Document 11: 1990 Wayne County Airport runway collision: The Wayne County Airport runway collision involved the collision of two Northwest Airlines planes in dense fog at Detroit Metropolitan Wayne County Airport on December 3, 1990. It occurred when Flight 1482, a scheduled Douglas DC-9-14 operating from Detroit to Pittsburgh International Airport, taxied onto an active runway by mistake in dense fog and was hit by a departing Boeing 727 operating as Flight 299 to Memphis International Airport. One crew and seven occupants of the DC-9 were killed.
Document 12: Northwest Airlines Flight 253: Northwest Airlines Flight 253 was an international passenger flight from Amsterdam Airport Schiphol in Haarlemmermeer, Netherlands, to Detroit Metropolitan Wayne County Airport in Romulus, Michigan, United States. The flight was the target of a failed al-Qaeda bombing attempt on Christmas Day, December 25, 2009, in which a passenger tried to set off plastic explosives sewn to his underwear. There were 290 people on board the aircraft—an Airbus A330-323E operated by Northwest Airlines, which had merged with Delta Air Lines the year before. Had the attempt succeeded, it would have surpassed American Airlines Flight 191 as the deadliest aviation occurrence on U.S. soil and tied Iran Air Flight 655 as the eighth-deadliest of all time. The incident was also the second in 2009 involving an Airbus A330, after the crash of Air France Flight 447 on June 1. This was also the final accident/incident involving Northwest Airlines as it closed down a month later when it merged with Delta Air Lines.
Document 13: Umar Farouk Abdulmutallab: Umar Farouk Abdulmutallab (Arabic: عمر فاروق عبد المطلب ; also known as Umar Abdul Mutallab and Omar Farooq al-Nigeri; born December 22, 1986) popularly referred to as the "Underwear Bomber", is a Nigerian man who, at the age of 23, confessed to and was convicted of attempting to detonate plastic explosives hidden in his underwear while on board Northwest Airlines Flight 253, en route from Amsterdam to Detroit, Michigan, on Christmas Day, 2009.
Document 14: Omar Altimimi: Omar Altimimi (born 6 August 1965) is a Dutch national of Bolton, England convicted of six counts of possessing computer files connected with the preparation or instigation of an act of terrorism under the Terrorism Act 2000, as well as two charges of money laundering under the Proceeds of Crime Act 2002. He is currently serving a nine-year sentence for these convictions.
Document 15: 2010 Portland car bomb plot: The 2010 Portland car bomb plot involved an incident in which Mohamed Osman Mohamud (born 1991), a Somali-American student, was arrested in an FBI sting operation on November 26, 2010, after attempting to set off what he thought was a car bomb at a Christmas tree lighting in Portland, Oregon. He was charged with attempting to use a weapon of mass destruction. An attorney for Mohamud argued that his client was entrapped. On January 31, 2013, a jury found Mohamud guilty of the single charge against him. He was scheduled to be sentenced on December 18, 2013, however the sentencing was cancelled in anticipation of the filing of new motions by the defense. In September 2014, Mohamud was sentenced to 30 years in federal prison with credit for time served, as well as lifetime supervision upon release in 2040.
ground_truth: Christmas Day, December 25, 2009