Ive recently been working at Jeppesen (im assuming youre talking about the UK) and these are the airlines which use them:
Easyjet
Thomas Cook
Thomsonfly
Excel
Virgin
Monarch
Netjets
Astraues
Flyglobespan
Mytravel
Air Contractors
Think thats all of them so quite a considerable number of Uk airlines. I dont know much about Aerads though im afraid.