Visual Elements Online Margins 1.27 Margins should have a minimum of 20 px 300 x 250 20 px clearance space from the edge 20 px Clearance of a layout. This is required to create consistency and to allow banners accommodate any outside element that online publishers may require. 20 px margins are the minimum requirement for banners, 300 x 250, or larger. Smaller units like the 180 x 150, 160 x 600 and the 728 x 90 can adjust to 15 px margins. 15 px 180 x 150 15 px Clearance © American Airlines, 2015 Advertising Guidelines, v 3.0