Lake Central Airlines served points in the Midwestern and eastern United States from 1950 to 1968, when it merged into Allegheny Airlines. In 1979 Allegheny became USAir. In 1997 USAir became US Airways. In 2015 US Airways was acquired by American Airlines.  Yet, somehow, this old (1954) schedule lives on — right up to the minute, complete with printed fares.  It’s marked with rubber stamps on the back, but authentic and complete.  Grade: 3