Alastair Grant, APPolice in riot gear sweep the area of demonstrators next to one of the memorials to the victims of the recent Brussels attacks at the Place de la Bourse in Brussels on March, 27, 2016.
Christopher Furlong / Getty ImagesA man observes a minute of silence at the Place De La Bourse on March 23, 2016, in honor of the victims of terror attacks the day before in Brussels, Belgium. Belgium is observing three days of national mourning after 34 people were killed in a twin suicide blast at Zaventem Airport and a bomb attack at Maelbeek Metro Station.
Philippe Huguen / AFP/Getty ImagesFlowers are placed on the ground near the Maalbeek subway station in Brussels.
AFP/Getty ImagesPlayers and fans pay their respects to the victims of the Brussels attacks before a soccer match between Italy and Spain in Udine, Italy on March 24, 2016.
Philippe Huguen / AFP/Getty ImagesMedics carry the body of a victim out of the Maelbeek subway station in Brussels on March 23, 2016, a day after the station and the Brussels-Zaventem airport were attacked.
Nicholas Maeterlinck / AFP/Getty ImagesPolice perform searches inside a railway station March 22, 2016, in Brussels, as subway stations opened with high security measures after a series of apparently coordinated explosions ripped through a Brussels airport and a metro train.
Kenzo Tribouillard / AFP/Getty ImagesKing Philippe of Belgium reacts as he and Queen Mathilde attend an homage ceremony at Palais de la Nation on March 24, 2016, in Brussels.
Carl Court / Getty ImagesWomen light candles to place with flowers near the Maelbeek metro station in Brussels following an attack the day before, on March 23, 2016.
Carl Court / Getty ImagesA woman and a young girl embrace as people gather to leave tributes in Bourse Square after attacks March 22, 2016, in Brussels.
Dirk Waem / AFP/Getty ImagesPeople are evacuated from Brussels airport in Zaventem on March 22, 2016 following twin blasts. A string of explosions rocked Brussels airport and a city metro station, killing at least 21 people in apparently coordinated attacks, officials said.
Patrik Stollarz / AFP/Getty ImagesA man reacts as people gather to observe a minute of silence in memory of the victims of the Brussels airport and metro bombings, on the Place de la Bourse in central Brussels, on March 23, 2016, a day after the triple blasts killed at least 30 people and wounded about 250.
Kenzo Tribouillard / AFP/Getty ImagesWomen hold hands as people gather at a makeshift memorial on the Place de la Bourse in Brussels on March 23, 2016.
Geert Vanden Wijngaert / APA man walks by solidarity messages written in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016.
Carl Court / Getty ImagesA woman lights a candle as people gather to leave tributes in Bourse Square after terrorist attacks March 22, 2016, in Brussels.
Evan Lamos / APIn this photo provided by Evan Lamos passengers clamber from a metro carriage after explosions in Brussels Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (Evan Lamos via AP)
Kenzo Tribouillard / AFP/Getty ImagesSpecial police forces stand guard outside the Council Chamber of Brussels on March 24, 2016, during investigations into the Paris and Brussels terror attacks. More than 30 people have been identified as being involved in a network behind the Nov. 13 Paris attacks, with links now established to this week's bombings in Brussels.
Philippe Huguen / AFP/Getty ImagesBrussels airport workers and their relatives react as they pay tribute to the victims near the airport in Zaventem on March 23, 2016, a day after attacks at the Brussels airport and at a subway train station killed at least 31 people and wounded more than 200.
Aurore Belot / AFP/Getty ImagesPeople gather to observe a minute of silence in memory of the victims of the Brussels airport and metro bombings, on the Place de la Bourse in central Brussels, on March 23, 2016.
Carl Court / Getty ImagesPolice officers stand guard on a road near Maelbeek Station following terror attacks on March 22, 2016 in Brussels, Belgium.The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels.
Patrik Stollarz / AFP/Getty ImagesSmoke rises after a bomb squad unit robot grabbed a suspicious object at a tramway station on March 25, 2016 in the Schaerbeek distrcit of Brussels.
Kenzo Tribouillard / AFP/Getty ImagesPeople write messages on the ground in Bourse Square following the terror attacks in Brussels on March 22, 2016.
Emmanuel Dunand / AFP/Getty ImagesA police officer sets a security perimeter near Maalbeek metro station, on March 22, 2016 in Brussels, after a blast at this station caused numerous deaths and injuries.
Geert Vanden Wijngaert / APPolice secure an area during a house search in the Etterbeek neighborhood in Brussels on Saturday April 9, 2016.
Phillipe Huguen / AFP/Getty ImagesPeople enter the Schuman subway station in Brussels on March 25, 2016, days after a suicide blast tore through another subway station, killing scores.
Carl Court / Getty ImagesPeople gather to leave tributes atin Bourse Square after terrorist attacks March 22, 2016, in Brussels.
Peter Dejong / APBelgium police leave after an investigating a house in the Anderlecht neighborhood of Brussels, Belgium, on March 23, 2016, one day after Tuesday's deadly suicide attacks on the Brussels airport and its subway system.
Martin Meissner / APPeople mourn for the victims of the bombings at the Place de la Bourse in the center of Brussels, on March 23, 2016.
AFP/Getty ImagesMohamed Abrini, left, and a screengrab of the Brussels Airport surveillance camera showing a suspect of this morning's attacks at Brussels Airport, in Zaventem, pushing a trolly with suitcases. Paris attacks suspect Mohamed Abrini confessed on April 10 to being "the man in the hat" caught on video.
Peter Dejong / APSoldiers patrol around the main court building in Brussels where Salah Abdeslam, the top suspect in last year's deadly Paris attacks, appeared before a judge March 24, 2016.
Thierry Roge, AFP/Getty ImagesA soldier directs motorists arriving at Brussels' airport in Zaventem on April 11, 2016.
Geert Vanden Wijngaert / APA family looks out the window of a bus while being evacuated from Brussels airport after explosions rocked the facility in Belgium on March 22, 2016.
AFP/Getty ImagesRescue teams evacuate wounded people outside the Maalbeek metro station in Brussels on March 22, 2016.
Geert Vanden Wijngaert / APPolice and other emergency workers stand in front of the damaged Zaventem Airport terminal in Brussels on March 23, 2016. Belgian authorities were searching Wednesday for a top suspect in the country's deadliest attacks in decades, as the European Union's capital awoke under guard and with limited public transport after scores were killed and injured in bombings on the Brussels airport and a subway station.
Andrew Harnik / AFP/Getty ImagesSecretary of State John Kerry participates in wreath-laying ceremony with a firefighter at the Brussels airport on March 25, 2016.
Michael Villa / AFP/Getty ImagesA private security guard helps a wounded woman outside the Maalbeek metro station in Brussels on March 22, 2016.
Thierry Charlier, AFP/Getty ImagesA member of the Muslim Community of Belgium holds up a sign reading "Terrorism has no religion" as people take part in a tribute, called by Muslim organizations, to the victims of the March 22 Brussels terror attacks outside of the Maelbeek / Maalbeek metro station in Brussels on April 9, 2016.
Kenzo Tribouillard / AFP/Getty ImagesPeople sing as they gather around a makeshift memorial at the Place de la Bourse in Brussels on March 23, 2016. World leaders united in condemning the carnage in Brussels and vowed to combat terrorism, after Islamic State bombers killed at least 31 people in a strike at the symbolic heart of the European Union.
Geert Vanden Wijngaert / APPeople react outside Brussels airport after explosions rocked the facility in Brussels, Belgium, on March 22, 2016.
Dirk Waem / AFP/ Getty ImagesA man with bloodstains on his shirt leaves Brussels airport in Zaventem on March 22, 2016, following twin blasts. A string of explosions rocked Brussels airport and a city metro station, killing at least 21 people in apparently coordinated attacks, officials said.
Sudpresse via APIn this frame made from video, a bomb disposal robot approaches a man who was shot at a tram stop in Brussels on March 25, 2016.
Kenzo Tribouillard / AFP/Getty ImagesYoung women hold each other at a makeshift memorial in front of the stock exchange in Brussels on March 22, 2016, following attacks in the Belgian capital that killed dozens of people.
Kenzo Tribouillard / AFP/Getty ImagesPeople hold hands as they gather at a makeshift memorial in Bourse Square following attacks in Brussels on March 22, 2016.
Geert Vanden Wijngaert, APA forensics officer works in front of the damaged Zaventem Airport terminal in Brussels. It's unclear when the Brussels Airport will reopen, even after a meeting Friday, April 1 by Prime Minister Charles Michel and key members of the government.
John Thys / AFP/Getty ImagesPassengers are evacuated from the Brussels airport on March 22, 2016 in Zaventem, after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal.
Aurore Belot / AFP/Getty ImagesSoldiers stand guard at the entrance of Brussels' central station, on March 23 2016, one day after the attacks on Brussels airport and at a metro station.
Ralph Usbeck / APA passenger lies on the ground in a smoke-filled terminal at Brussels Airport after explosions March 22, 2016. Authorities locked down the Belgian capital after explosions rocked the Brussels airport and the city's subway system.
APA video still shows police arresting a man in the Anderlecht area of Brussels on April 8, 2016.
Carl Court / Getty ImagesA message is written on the ground as people leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium.
Geert Vanden Wijngaert / APPeople are evacuated from Brussels airport after explosions rocked the facility in Belgium on March 22, 2016. Explosions hit the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said.
Emmanuel Dunand / AFP/Getty ImagesA security perimeter has been set, on March 22, 2016 near Maalbeek metro station in Brussels, after a blast at this station near the EU institutions caused deaths and injuries.
Kenzo Tribouillard / AFP/Getty ImagesPeople hold a minute of silence around a makeshift memorial at Place de la Bourse in Brussels on March 23, 2016, a day after blasts hit the Belgian capital.
Emmanuel Dunand / AFP/Getty ImagesA victim receives first aid by rescuers March 22, 2016, near the Maalbeek metro station in Brussels, after an explosion at the station.
Valentin Bianchi / APPeople gather at a memorial site located at the old stock exchange in Brussels on March 23, 2016.
Martin Meissner / APPeople bring flowers and candles to mourn the victims of the terror attacks in Brussels on March 22, 2016.
Kenzo Tribouillard / AFP/Getty ImagesA woman puts a Belgian flag at a makeshift memorial in Bourse Square in Brussels following the terrorist attacks March 22, 2016.
Cedric Simon/ AFP/Getty ImagesA Belgian soldier stands guard outside the Maalbeek metro station in Brussels on March 22, 2016, after an explosion at the station, which is located near European Union institutions.
Alastair Grant / APA young man draped in the Belgian flag and surrounded by chalked tributes lights a row of candles for the victims of the recent attacks in Brussels near Place de la Bourse in the center of Brussels on March, 24, 2016.
Geert Vanden Wijngaert, APAn arrivals and departure board is seen behind blown out windows at Zaventem Airport in Brussels. It's unclear when the Brussels Airport will reopen, even after a meeting Friday, April 1 by Prime Minister Charles Michel and key members of the government.
Andrew Harnik / APSecretary of State John Kerry and Belgian Prime Minister Charles Michel give a joint statement at the Belgian Prime Minister's Residence in Brussels on March 25, 2016.
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Police in riot gear sweep the area of demonstrators next to one of the memorials to the victims of the recent Brussels attacks at the Place de la Bourse in Brussels on March, 27, 2016.
ExpandBy Becky Yerak
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United Airlines said it’s offering customers ticketed on flights to and from Brussels through Thursday additional flexibility to reschedule or change itineraries in the wake of deadly terrorist attacks.
The Chicago-based airline will waive change fees and any differences in fare for customers who rebook their travel to Brussels through April 1, subject to Brussels Zaventem International Airport reopening and flights resuming.
For customers wanting to postpone travel to Brussels until after April 1, and for customers wanting to fly to a new destination, United will waive the change fee. A difference in fare may apply.
Rescheduled travel must be completed within one year of the date when the original ticket was issued.
Customers ticketed on canceled flights may receive a refund.
United said it was canceling two flights scheduled to depart for Brussels on Tuesday evening, one from Washington Dulles International Airport and one from Newark Liberty.
Twitter @beckyyerak