A film about the 11 September attacks will premiere on the opening night of New York's Tribeca Film Festival.
United 93 is directed by British film-maker Paul Greengrass
United 93 chronicles the fourth hijacked airliner which passengers attempted to retake from hijackers before it crashed in Pennsylvania.
Families of the victims and 11 September support groups will see the film ahead of its 25 April debut.
Tribeca was set up by Robert De Niro to help revitalise Manhattan's economy in the wake of the terrorist attacks.
The fifth festival, which runs through until 7 May, is expected to feature 250 films.
United 93, which is directed by British film-maker Paul Greengrass, whose credits include Bloody Sunday and The Bourne Supremacy, is a real-time account of the plane's hijack until its crash 90 minutes later.
It is believed that the White House was the intended target of the flight before it was steered off course after passengers intervened.
"We are honoured to showcase a film that portrays a story of bravery and sacrifice of the men and women who dedicated their lives that day aboard United Flight 93," said the festival's co-founder Jane Rosenthal.
United Airlines flight 93 crashed in Shanksville, Pennsylvania
"9/11 changed us, in indescribable personal ways, but also by forever altering our downtown community," she added.
Film director Oliver Stone has also made a film about the 11 September attacks, called World Trade Center.
It will follow a day in the lives of two New York Port Authority officers who became trapped under the rubble of the Twin Towers.
A made-for-television docu-drama about Flight 93 aired in the US recently.
It became the most-watched programme on the A&E network, drawing close to six million viewers.