If you fly then you have probably seen the SkyMall catalog, that oddly curated assemblage of items from other catalogs designed to make sure that even while in flight you can contemplate purchases. Now you can actually buy the items while in flight. SkyMall and a company called GuestLogix have partnered to deliver a new on-board shopping service. Passengers will be able to buy products inflight using a handheld electronic device from GuestLogix that can accept the swipe of a credit card or scan a barcode to complete the purchase.