Instructions: You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.
Input: Paragraph- Sent 1: At 9:34, Ronald Reagan Washington National Airport advised the Secret Service of an unknown aircraft heading in the direction of the White House.
Sent 2: American 77 was then 5 miles west-southwest of the Pentagon and began a 330-degree turn.
Sent 3: At the end of the turn, it was descending through 2,200 feet, pointed toward the Pentagon and downtown Washington.
Sent 4: The hijacker pilot then advanced the throttles to maximum power and dove toward the Pentagon.
Sent 5: At 9:37:46, American Airlines Flight 77 crashed into the Pentagon, traveling at approximately 530 miles per hour.
Sent 6: All on board, as well as many civilian and military personnel in the building, were killed.
Sent 7: The Battle for United 93 At 8:42, United Airlines Flight 93 took off from Newark (New Jersey) Liberty International Airport bound for San Francisco.
Sent 8: The aircraft was piloted by Captain Jason Dahl and First Officer Leroy Homer, and there were five flight attendants.
Sent 9: Thirty-seven passengers, including the hijackers, boarded the plane.
Sent 10: Scheduled to depart the gate at 8:00, the Boeing 757's takeoff was delayed because of the airport's typically heavy morning traffic.
Sent 11: The hijackers had planned to take flights scheduled to depart at 7:45 (American 11), 8:00 (United 175 and United 93), and 8:10 (American 77).
Sent 12: Three of the flights had actually taken off within 10 to 15 minutes of their planned departure times.
Sent 13: United 93 would ordinarily have taken off about 15 minutes after pulling away from the gate.
Sent 14: When it left the ground at 8:42, the flight was running more than 25 minutes late.
Sent 15: As United 93 left Newark, the flight's crew members were unaware of the hijacking of American 11.
Sent 16: Around 9:00, the FAA, American, and United were facing the staggering realization of apparent multiple hijackings.
Sent 17: At 9:03, they would see another aircraft strike the World Trade Center.
Sent 18: Crisis managers at the FAA and the airlines did not yet act to warn other aircraft.
Output:
What flights were hijakced on 9/11?