Helios has also denied delaying the release of the passenger list although a company representative acknowledged that a list released on Monday had been "not definitive".
Blue Coat and NetApp both denied selling equipment to Syria, which is on the U.S. sanctions list, and insist that their equipment was redirected without their knowledge.
She has recently denied other rumours suggesting she might become a European commissioner, or leader of the Socialist list for the European Parliament to be elected next year.
Monday, Defense Department official Michele Jones denied in a statement obtained by CNN that she helped try to get the couple on the list for the state dinner.
One young woman on the waiting list, Andrea Beckett, said it was unfair that she and other sufferers were being denied drugs which could dramatically change their lives.