emirates airlines sold shahzad a ticket to pakistan seven hours after his name was added to the no-fly list. the proposal from chuck schumer and others of his colleagues would require that airlines flag to the tsa any passenger who pays cash for an airline ticket. but a different gap in security remains wide open. individuals on the list have the same right to buy guns and explosives as anyone else. calling it the terror gap, michael bloomberg asked congress to give the government the ability to block purchase of guns by suspected terrorists. shahzad was not placed on the list until monday but the mayor noted if the government places people on a no fly list and terror watch list, why not also prevent them from buying firearms while they're on the list? but in the hearing at capitol hill, the two senators on the panel, collins and graham, worried about the second amendment rights of law-abiding