File:Coach 1950-1978.png

Percentage of US passenger traffic traveling in coach class 1950-1978 (vs first class).

Underlying data is from the following. These are all publications of the US govt, the Civil Aeronautics Board being a defunct Federal agency that once regulated the airline business.

{{cite report|title=Annual Report of the Civil Aeronautics Board 1957|date=1958|publisher=U.S. Government Printing Office|location=Washington, DC|page=38|url=https://hdl.handle.net/2027/uc1.b4263895?urlappend=%3Bseq=66%3Bownerid=9007199266778352-68|hdl=2027/uc1.b4263895|hdl-access=free}}

{{cite report|title=Annual Report of the Civil Aeronautics Board 1964|date=1964|publisher=U.S. Government Printing Office|location=Washington, DC|page=86|url=https://hdl.handle.net/2027/hvd.hl0j5c?urlappend=%3Bseq=106%3Bownerid=116419259-114|hdl=2027/hvd.hl0j5c|hdl-access=free}}

{{cite report|title= Civil Aeronautics Board Reports To Congress Fiscal Year 1977 & Transitional Quarter|date=1977|publisher=U.S. Government Printing Office|location=Washington, DC |page=118–121 |url= https://hdl.handle.net/2027/pst.000067708109?urlappend=%3Bseq=130%3Bownerid=13510798900124084-138|hdl=2027/pst.000067708109|hdl-access=free}}

{{cite report|publisher=Civil Aeronautics Board|title=Supplement to the Handbook of Airline Statistics: Calendar Years 1977 and 1978|date=November 1979|chapter=Part III. Traffic Statistics|pages=7, 35|url=https://hdl.handle.net/2027/osu.32435025695669|hdl=2027/osu.32435025695669|hdl-access=free}}

{{cite report|publisher=Civil Aeronautics Board|title=CAB Air Carrier Traffic Statistics|date=December 1980|location=Washington, DC|pages=1, 151|url=https://hdl.handle.net/2027/osu.32435066764234?urlappend=%3Bseq=171%3Bownerid=102793873-175|hdl=2027/osu.32435066764234|hdl-access=free}}

{{cite report|publisher=Civil Aeronautics Board|title=CAB Air Carrier Traffic Statistics|date=December 1982|location=Washington, DC|page=1|url=https://hdl.handle.net/2027/uiug.30112105053760?urlappend=%3Bseq=8%3Bownerid=32627580-7|hdl=2027/uiug.30112105053760|hdl-access=free}}

{{cite report|publisher=Civil Aeronautics Board|title=CAB Air Carrier Traffic Statistics|date=December 1983|location=Washington, DC|page=1|url=https://hdl.handle.net/2027/uiug.30112105053877?urlappend=%3Bseq=9%3Bownerid=32682698-8|hdl=2027/uiug.30112105053877|hdl-access=free}}

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