Aeropostale, like some other teen apparel retailers, has been losing customers to “fast-fashion” chains such as H&M (HMb.ST), Forever 21 and Inditex’s (ITX.MC) Zara and sportswear makers such as Nike Inc (NKE.N) and Under Armour Inc (UA.N). The mall-based retailer offered heavy discounts on older merchandise to make way for newer and trendier styles for the crucial back-to-school shopping season, Chief Executive Julian Geiger said on a conference call. Aeropostale’s comparable sales, including its e-commerce channel, fell 8 percent in the second quarter.