double bill

Yu Miri の小説 "Tokyo Ueno Station" を読んでいます。

I saw some bright red coin lockers, and my eye caught the sign for Ueno Star Movie, known among the homeless as the little porno theater. In one building there were three theaters: Star Movie, which showed double bills of old films; Jaman Masterpiece Theater, which specialized in your average pornos, and World Masterpiece Theater, which specialized in gay porn.

"double bills" の意味を調べます。

・Oxford English Dictionary: two films, television programs, etc. that are shown one after the other: a cartoon double bill
・Collins Dictionary: A double bill is a theatre or cinema performance in which there are two shows on the program.: There was one cinema near us that did two double bills a week.
・Cambridge English Dictionary: a performance at a cinema or theatre that consists of two main films or plays: The second and third episodes were shown together as a double bill.

二本立ての事ですね。最近映画を見に行かなくなったで分かりませんが、今でも "double bills" の上映があるのでしょうか？
"double bills" の "bill" は元々、以前（2/27/2012 ）取り上げた、 "official bill" の "bill" から来ているのですね。　日本語のビラの語源でしょう。