Mainline

[aeronautics] A mainline flight is a flight operated by an airline`s main operating unit, rather than by regional alliances, regional code-shares or regional subsidiaries. In the USA, examples of mainline passenger airline flights include those operated by American Airlines, Delta Air Lines, United Airlines, and US Airways but it would not ...
Found on http://en.wikipedia.org/wiki/Mainline_(aeronautics)

Mainline

A reference to long-standing denominational establishments; mainline churches are those such as the Presbyterians, Episcopalians, and others.
Found on http://www.victorious.org/cbook/glossary

Mainline

A reference to long-standing denominational establishments; mainline churches are those such as the Presbyterians, Episcopalians, and others.
Found on http://www.victorious.org/cbook/glossary

mainline

describes the main body of line that you are using that fills the majority of your spool.
Found on https://www.encyclo.co.uk/local/22505

mainline

The line attached to the buttrigging used to pull logs to the landing.
Found on http://www.translationdirectory.com/glossaries/glossary060.htm

Mainline

the main fishing line on the fishing reel
Found on http://www.fish-uk.com/dictionary.htm

mainline

[v] - inject into the vein
Found on http://www.webdictionary.co.uk/definition.php?query=mainline
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