Airlines such as American, Delta, Jet Blue and United were helping provide assistance to the country in the form of free miles for its program members and seats for aid organizations.
Ministers have denied the decision to free Megrahi, who served 10 years of his life sentence for the bombing of a Pan Am jet over Lockerbie, was linked to trade deals with Tripoli.
Other reported contributions include offering more CF-18 jet fighters for joint patrols of North American skies and Canadian soldiers for peacekeeping duties in Bosnia to free U.S. troops there for duty elsewhere.