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.
Still others are working on it. But in the U.S. cell phone calls in flight are still banned, by both the FAA and the FCC (the FAA worries about the safety of planes, while the FCC worries about the safety of the cellular service).