Interline

Interline twitter occurs on interlaced displays at half the field-rate.

American Airlines and British Airways have an interline agreement to handle each other's baggage and to accept each other's tickets.

I had an interline connection from Delta to AA in Dallas/Ft. Worth.

to interline a page or a book

Then riſing with Aurora’s Light, / The Muse invok’d, ſit down to write; / Blot out, correct, inſert, refine, / Enlarge, diminiſh, interline; / Be mindful, when Invention fails, / To ſcratch your Head, and bite your Nails.

When by this way of interlining Latin and Englisſh one with another, he has got a moderate Knowledge of the Latin Tongue, he may then be advanc'd a little farther to the reading of ſome other eaſie Latin Book, […]

For each contracted frown, / A crooked wrinkle interlines my brow: / Spend but one hour in frowns, and I shall look / Like to a beldam of one hundred years.