Types of abstracts. There are two types of abstracts: descriptive and informative. They have different aims, so as a consequence they have different components and styles. There is also a third type called critical, but it is rarely used.
Samsung Galaxy Note 7 smartphone has been banned from all aircraft in the United States. The US Transportation Department and other agencies have banned passengers from carrying on the devices or putting them inside checked baggage during flights.
Most mobile devices have this setting, identified by a small icon representing an airplane. While in airplane mode, all wireless services, including Wi-Fi, cellular and Bluetooth, are automatically disabled. This is to prevent signals from passenger's devices from disrupting the flight.