Pan Am - April, 1982

Sorry for the lousy scan of the route map, but it was a four-panel version.

https://en.wikipedia.org/wiki/Pan_American_World_Airways

Rocky Mountain Airways - July, 1973

Both back and front covers are an interesting way to present a route map. Rocky Mountain was acquired by Britt, which itself would later merge with ExpressJet.

https://en.wikipedia.org/wiki/Rocky_Mountain_Airways

Bonanza Air Lines - April, 1966

If you ever pass through LAS with some extra time, I highly suggest you find the space dedicated to the history of McCarran International Airport. If I remember correctly, the airport stationary had four airlines listed, and Bonanza was one of them.

https://en.wikipedia.org/wiki/Bonanza_Air_Lines
https://en.wikipedia.org/wiki/McCarran_International_Airport

Gem State Airlines - January, 1979

Gem States Airlines served Idaho and Washington locations in this timetable. It would later merge with Air Pacific.

https://en.wikipedia.org/wiki/Gem_State_Airlines
https://en.wikipedia.org/wiki/Air_Pacific_(United_States)

North Central Airlines - June, 1979

Following a merger with Southern Airways in 1979, North Central became Republic Airlines, which merged into Northwest Airlines in 1986. That lineage would make it part of today's Delta Air Lines.

https://en.wikipedia.org/wiki/North_Central_Airlines

Merrimack Airlines - April, 1979

I was able to find this about Merrimack:

Main office in Bedford, Mass. ...aircraft are eight‐passenger Navaho Chieftains ... no attendants or meal service ... seven round trips a day between Westchester and Boston, one a day between Westchester and Albany ... flights continue or connect to Burlington, Vt., Providence, R.I., Bedford, Mass. ... some weekend flights .. . fares $47 one way to Boston, $42 to Albany.

http://www.nytimes.com/1979/08/19/archives/westchester-weekly-commuter-flights-seek-to-fill-alleghany-role.html

Here's what a Chieftain looks like:

Trans Central Airlines - August, 1980

Here's an article about the demise of Trans Central.

Mid Pacific Air - January, 1982

Mid Pacific tried to compete against Aloha and Hawaiian, but ended its island operations in 1988.

https://en.wikipedia.org/wiki/Mid_Pacific_Air

National Airlines - June, 1978

A great timetable from National Airlines.

https://en.wikipedia.org/wiki/National_Airlines_(1934–1980)