1) Big name in airlines, once 2) Criticize a yankee 3) Describing OAS 4) Of the Western Hemisphere 5) One-time big airline name 
[train] The Pan-American was a passenger train operated by the Louisville and Nashville Railroad (L&N) between Cincinnati, Ohio and New Orleans, Louisiana. It operated from 1921 until 1971. From 1921 to 1965 a section served Memphis, Tennessee via Bowling Green, Kentucky. The Pan-American was the L&N`s flagship train until the introduction ...
• (a.) Of or pertaining to both North and South America.
Pan`-A·mer'i·can adjective [ See Pan- .] Of or pertaining to both North and South America. 
Pan-American Relating to the nations of North, South, and Central America; collectively or in cooperatiion with each other.