The Americans with Disabilities Act (ADA) is the most commonly cited disability discrimination law. The ADA was enacted in 1990, though its roots stretch back to the civil rights era of the 1960s. Since the 1960s, many additional laws protecting the rights of the disabled were added to the books, including the 1986 Air Carrier Access Act and the 1988 Fair Housing Amendments Act. The Air Carrier Access Act provided the disabled with the right to use air transportation, which for many had previously been all but impossible. The Fair Housing Amendments Act extended the previously established rights of selling and purchasing housing without discrimination to the disabled. These laws and many others were combined into the comprehensive ADA bill. On July 26, 1900, in front of an audience of over three thousand advocates of disability rights, President George Bush signed into law the Americans with Disabilities Act.