FILE - In this file photo of June 19, 2011, an American Airlines slipper is stored in Hangar 17 at John F. Kennedy International Airport in New York. The slipper is an artifact from the September 11, 2001 attacks that is to be part of the National September 11 Museum. A group of 9/11 family members on Wednesday, June 27, 2012 accused the governors of New York and New Jersey of betraying the people killed in the 2001 terrorist attacks, urging them to resolve a financial disagreement that has hobbled construction of the ground zero museum meant to memorialize those lost. (AP Photo/Mark Lennihan,

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Not available to licence for any broadcast or streaming service, video on demand, film, national newspaper or to create a NFT. This content is intended for editorial use only. For other uses, additional clearances may be required. FILE - In this file photo of June 19, 2011, an American Airlines slipper is stored in Hangar 17 at John F. Kennedy International Airport in New York. The slipper is an artifact from the September 11, 2001 attacks that is to be part of the National September 11 Museum. A group of 9/11 family members on Wednesday, June 27, 2012 accused the governors of New York and New Jersey of betraying the people killed in the 2001 terrorist attacks, urging them to resolve a financial disagreement that has hobbled construction of the ground zero museum meant to memorialize those lost. (AP Photo/Mark Lennihan, File)