Like most local service airlines Southern flew only Douglas DC-3s for the first few years. In 1961 they began adding 22 40-passenger secondhand Martin 4-0-4s acquired from Eastern Air Lines, newer aircraft that were pressurised and had a rear ventral stairway. The last DC-3 was retired in 1967.
Community Q&A. An operating system (OS) is software that manages the interaction between hardware resources and the programs or applications you use on a computer. Most PCs have a version of the Windows operating system on them but Macintosh, Linux and UNIX are other popular operating systems.
windows rt for runtime is a version of microsoft s windows 8 operating system os designed for mobile devices particularly tablet pcs windows rt should not be confused with winrt the windows runtime library that provides system services for metro apps windows rt was originally called windows on arm woa because it is meant to run on arm processors the operating system has been likened to a tablet version of windows phone because it features a similar tile based ui user interface the os will come pre installed on hardware not as a stand alone product