Some airline costs are going down, but ticket prices are still going up. The biggest expense for any airline is fuel, and the price of jet fuel is down 18% since August. Still, airfares are up 3% this year according to the industry trade group Airlines for America. And they've climbed 31% since 2009. But the high prices haven't chased away fliers-planes are more packed than they've ever been. About 85% of seats have been filled so far this year, a record high.
From Wikipedia, the free encyclopedia. Synchronous and asynchronous transmissions are two different methods of transmission synchronization. Synchronous transmissions are synchronized by an external clock, while asynchronous transmissions are synchronized by special signals along the transmission medium. 1 The need for synchronization.
These asynchronous forms of communication are sometimes supplemented with synchronous components, including text and voice chat, telephone conversations, videoconferencing, and even meetings in virtual spaces such as Second Life, where discussions can be facilitated among groups of students.