Does anyone know what this icon means?  

 I didn’t either when I was riding jumpseat on USAirways. I asked the flight crew who also didn’t know what it meant. Said its been there for a while. They just assumed it meant American. Well it’s almost true. Recently at my place of employment we were given upgraded charts. I found out the icon simply means this is an airline chart. Specially designed for use with airline pilots. I would guess any pilot could pay the extra for these charts but the icon itself means airline. As well as the squared off icon on the page numbers.  

 
I’m just glad I was able to answer my own question from a month ago when riding in the flight deck across the country.