Pent-up demand for a larger iPhone seems to have driven Apple to a new opening day pre-sale record. The company announced Monday morning that in the first 24 hours of ordering, the iPhone 6 and iPhone Plus models pre-sold over 4 million units. Consumers quickly went through Apple/s allotted pre-order supply that could be delivered on launch day, Sept. 19. While limited quantities of the devices will be available to line-waiters worldwide this Friday morning, online ordering is now backed up into October deliveries for most models. Demand for the super-sized 5.5-inch iPhone 6 Plus model appears to be especially strong, as those models sold out the initial supply within hours last week.