Which airlines allow electronic device usage under 10,000 feet?

Ever since the FAA has changed the rules around use of personal electronics such as iPhones, iPads and iPod touch devices, airlines have been lining up for approval from the agency. After approval, these devices can be used by passengers at all stages of flight in Airplane Mode. Previously, iPhones and the like were to be switched off until reaching an altitude of 10,000 feet.