The passenger jet that crashed minutes after taking off in Tehran on Wednesday, killing all 176 people on board, was one of 19 flights that took off from the city’s international airport in the hours after Iran launched missiles at military bases in neighboring Iraq that housed American troops.

Despite the crash and the attacks, flight activity at Imam Khomeini International Airport that day was startlingly similar to activity in recent weeks, according to data from FlightAware, an industry tracking firm.

Comparing Wednesday morning flights departing from Imam Khomeini airport 12 a.m. 12 a.m. 12 a.m. 1 a.m. 1 a.m. 1 a.m. 2 a.m. 2 a.m. 2 a.m. 3 a.m. 3 a.m. 3 a.m. 4 a.m. 4 a.m. 4 a.m. 5 a.m. 5 a.m. 5 a.m. 6 a.m. 6 a.m. 6 a.m. 7 a.m. 7 a.m. 7 a.m. 8 a.m. 8 a.m. 8 a.m. 9 a.m. 9 a.m. 9 a.m. 10 a.m. 10 a.m. 10 a.m. 11 a.m. 11 a.m. 11 a.m. 12 p.m. Ukraine International Flight 752 took off. It crashed minutes later. Iranian missiles began to strike two military bases in Iraq housing U.S. troops. Wed., Jan. 8 Two flights after Flight 752 were canceled. Iran Air Flight 721 took off soon after the crash. 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m. 7 a.m. 8 a.m. 9 a.m. 10 a.m. 11 a.m. 12 p.m. 12 p.m. Flight 752 Wed., Jan. 1 Flight 752 Wed., Dec. 25 Flight 752 Wed., Dec. 18 Flight 752 Wed., Dec. 11 Iranian missiles began to strike two military bases in Iraq housing U.S. troops. Ukraine International Flight 752 took off. It crashed minutes later. Wed., Jan. 8 Two flights after Flight 752 were canceled. Iran Air Flight 721 took off soon after the crash. 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m. 7 a.m. 8 a.m. 9 a.m. 10 a.m. 11 a.m. 12 p.m. Flight 752 Wed., Jan. 1 Flight 752 Wed., Dec. 25 Flight 752 Wed., Dec. 18 Flight 752 Wed., Dec. 11 12 a.m. 2 a.m. 4 a.m. 6 a.m. 8 a.m. 10 a.m. 12 p.m. Iranian missiles began to strike two military bases in Iraq housing U.S. troops. Ukraine International Flight 752 took off. It crashed minutes later. Wed., Jan. 8 Two flights after Flight 752 were canceled . Iran Air Flight 721 took off soon after the crash. 12 a.m. 2 a.m. 4 a.m. 6 a.m. 8 a.m. 10 a.m. 12 p.m. Flight 752 Wed., Jan. 1 Flight 752 Wed., Dec. 25 Flight 752 Wed., Dec. 18 Flight 752 Wed., Dec. 11 12 a.m. 2 a.m. 4 a.m. 6 a.m. 8 a.m. 10 a.m. 12 p.m. Iranian missiles began to strike two military bases in Iraq housing U.S. troops. Ukraine International Flight 752 took off. It crashed minutes later. Wed., Jan. 8 Two flights after Flight 752 were canceled. Iran Air Flight 721 took off soon after the crash. 12 a.m. 2 a.m. 4 a.m. 6 a.m. 8 a.m. 10 a.m. 12 p.m. Flight 752 Wed., Jan. 1 Flight 752 Wed., Dec. 25 Flight 752 Wed., Dec. 18 Flight 752 Wed., Dec. 11 Wednesday, Jan. 8 12 a.m. 3 a.m. 6 a.m. 9 a.m. 12 p.m. Iranian missiles struck two bases in Iraq. Ukraine International Flight 752 took off. It crashed minutes later. Flights: Two flights after Flight 752 were canceled. Iran Air Flight 721 took off soon after the crash. Wed., Jan. 1 Flight 752 Wed., Dec. 25 Flight 752 Wed., Dec. 18 Flight 752 Wed., Dec. 11 Flight 752 Source: FlightAware

Why flights resumed so soon after the military strikes remains unclear.

The flight that crashed — Ukraine International Airlines Flight 752 — was the ninth one to take off from the airport after the attacks had begun. Iran suggested soon after the crash that mechanical failure might have been the cause, but on Saturday the country’s military announced that it had shot down the plane by accident, citing human error.

Not long after the attacks on the bases, the Federal Aviation Administration issued a restriction on all American carriers, banning them from flying in the region’s airspace.

A spokeswoman for Austrian Airlines said its flight to Vienna scheduled for 3:45 a.m. took off because there were no additional security constraints in place from the Tehran airport or other authorities, though the airline did cancel flights into Iraq after news of the missile strikes.

Flights departing from Imam Khomeini airport the morning of Jan. 8 Frankfurt Moscow Vienna Kyiv UKRAINE Flight 752 to Kyiv crashed minutes after it took off at 6:12 a.m. Istanbul Baku Missiles from Iran hit military bases in Iraq starting at 2:15 a.m. Tehran Baghdad IRAN IRAQ To Hong Kong Doha Dubai Frankfurt Moscow Vienna Kyiv Flight 752 to Kyiv crashed minutes after it took off at 6:12 a.m. UKRAINE Istanbul Baku Missiles from Iran hit military bases in Iraq starting at 2:15 a.m. Tehran IRAQ IRAN To Hong Kong Doha Dubai Frankfurt Moscow Vienna Kyiv UKRAINE Flight 752 to Kyiv crashed minutes after it took off at 6:12 a.m. Istanbul Baku Missiles from Iran hit military bases in Iraq starting at 2:15 a.m. Tehran Baghdad IRAQ IRAN To Hong Kong Doha Dubai Frankfurt Moscow Vienna Kyiv UKRAINE Flight 752 to Kyiv crashed minutes after it took off at 6:12 a.m. Istanbul Baku Missiles from Iran hit military bases in Iraq starting at 2:15 a.m. Tehran Baghdad IRAN IRAQ To Hong Kong Doha Dubai Source: Flightradar24. | Note: Flights before 8:30 a.m. local time on Jan. 8 are shown.

Danielle Lupton, an assistant professor of political science at Colgate University, suggested that Iran’s focus at the time was likely on retaliating against the United States for killing Maj. Gen. Qassim Suleimani, a powerful Iranian commander.

“If you’re shutting down all of your airspace, you might not want to do that tactically, because it’s a pretty big signal to your opponent,” Ms. Lupton said.

The traffic pattern at the airport that morning, with the exception of the crash, was much like patterns the previous four Wednesdays. On Jan. 1, 20 flights took off before noon. On the Wednesday before that, there were 26.

This Wednesday, Flight 752 took off nearly an hour behind schedule. A Ukrainian official on Friday said the delay was caused by the unloading of cargo from the plane.

The two flights that were scheduled to take off right after the Ukrainian jet were canceled, according to FlightAware. Both were bound for Istanbul.

But at least eight flights operated by Iran Air flew out of Imam Khomeini airport in the hours after the crash, the data shows. Other airlines whose flights took off shortly after the crash included Emirates, Turkish Airlines and Mahan Air, another Iranian carrier.

Flight 752 crashed just a few miles from the airport. Ukrainian officials said on Friday that they had analyzed the plane’s flight pattern and determined that it had stayed within the normal corridor for flights out of the airport.

Flights that took off before Flight 752 Flights that took off after Flight 752 TEHRAN Site of crash The last signal was received two minutes after takeoff. UKRAINE INTERNATIONAL AIRLINES FLIGHT 752 Imam Khomeini International Airport Flight 752 departed at 6:12 a.m. 2 MILES Flights that took off before Flight 752 Flights that took off after Flight 752 TEHRAN Site of crash The last signal was received two minutes after takeoff. UKRAINE INTERNATIONAL AIRLINES FLIGHT 752 Imam Khomeini Intl. Airport Flight 752 departed at 6:12 a.m. 2 MILES Flights that took off before Flight 752 Flights that took off after Flight 752 Site of crash TEHRAN The last signal was received two minutes after takeoff. UKRAINE INTERNATIONAL AIRLINES FLIGHT 752 Imam Khomeini International Airport 2 MILES Flight 752 departed at 6:12 a.m. Flights that took off before Flight 752 Flights that took off after Flight 752 Site of crash TEHRAN The last signal was received two minutes after takeoff. UKRAINE INTERNATIONAL AIRLINES FLIGHT 752 Imam Khomeini International Airport 2 MILES Flight 752 departed at 6:12 a.m. Source: Flightradar24. | Note: Flights before 8:30 a.m. local time on Jan. 8 are shown.

Iran said the plane turned toward a sensitive military base, leading Iranian missiles to bring it down. Video verified by The Times appeared to show the plane heading back toward the airport when it crashed.

“The protocol is that the government that owns the airspace is responsible to notify everybody if there is a change in the security of the airspace,” said John Cox, an accident investigator and head of an aviation consulting firm. “If there are missiles flying around, the government has the responsibility to let everybody know.”

In a statement, a Lufthansa Group spokeswoman said all of its airlines, including Lufthansa and Austrian Airlines, were canceling flights into or out of Tehran through Jan. 20 “as a precautionary measure.”