The negotiation of a new aviation security treaty that would address emerging threats to aviation was in part prompted by the September 11 attacks . At the conclusion of the conference , the U.S. delegate stated that " o n the eve of the anniversary of the 9/11 terrorist attacks , the United States can think of no more fitting and hopeful way to mark that occasion than with the adoption of these two new major counterterrorism instruments . " The treaty entered into force on 1 July 2018 following Turkey 's accession thereto . It has been signed by 35 states and ratified or acceded to by 26 ( as of September 2018 )
September 11 attacks
September 11 attacks
Beijing Convention