Japan Airlines is planning to discontinue its once-popular flight attendant calendars after a 20-year run because of cost concerns, company sources said Saturday.

First published in 1989 at the height of the bubble economy, the wall and desktop calendars usually hit bookstores at the end of each year. Older versions have fetched nearly ¥10,000 apiece in Internet auctions.

Around 100,000 copies were printed in 1993, when demand peaked, but sales are gradually falling and have leveled out at about 50,000 copies for the 2009 version.