Frequent Flyer Bras: A Japanese company is lending its support to women in the war against terrorism: a bra guaranteed not to set off airport metal detectors. Triumph International Ltd. came up with the idea after a newspaper story reported a woman’s bra set off an airport metal detector in the aftermath of the Sept. 11 attacks, company spokeswoman Hiromi Shinta said. Triumph designers said they will market the metal-free brassiere after figuring out how to make them. The bras will be made without tiny metallic bra fasteners company officials said cause havoc amid tightened security measures at airports. The new bra incorporates resinous wires and nonmagnetic metal hooks that do not trigger metal detectors, the company claims.