Many customers will have to wait three to four weeks to get their hands on Apple Inc's larger screen iPhone 6 Plus after pre-orders for September 19 delivery were booked out within hours. The smaller 4.7-inch iPhone 6 is still available for delivery on September 19, Apple's website showed. Apple's iPhone 6 Plus, which has a 5.5-inch display, goes on sale in US stores on September 19. Websites of Apple's carrier partners, Verizon Wireless, AT&T and Sprint Corp, also showed delays of up to six weeks.