If you're looking for a bulk supply download, we have over 16,000 aircraft silhouettes, profiles and operator logos available in Zip files. These are in bmp file format, 85x20 pixels.
These Zip files are already our most popular downloads and a great way to enhance your BaseStation or Virtual Radar Server display. My Thanks to Ian K, Paulm and Steve Hibberd for making them available. And we can easily host more files if you have some to share.